[PWGDQ] Fill truth-level mass distribution

[dmallick2]

Add truth-level mass distribution in THnSparse

[github-actions]

O2 linter results: ❌ 71 errors, ⚠️ 126 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for d5853ea at 2026-07-09 13:52:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 111 errors and 1 warnings.'
Found 111 errors and 1 warnings.
++ [[ 111 -gt 0 ]]
++ cat /sw/BUILD/c39d332c77006fc4315a810200d780575ae4b4c3/O2Physics-code-check/errors.txt
PWGDQ/Core/HistogramsLibrary.cxx:302:128: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:303:128: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:747:9: error: uninitialized record type: 'pIN_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:756:9: error: uninitialized record type: 'TPCdEdx_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:762:9: error: uninitialized record type: 'nSigma_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:825:7: error: uninitialized record type: 'tpcNsigmaBinLims' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:837:7: error: uninitialized record type: 'tpcNclusterBinLims' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:885:9: error: uninitialized record type: 'pIN_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:894:9: error: uninitialized record type: 'TOFbeta_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:900:9: error: uninitialized record type: 'nSigma_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:922:7: error: uninitialized record type: 'pIN_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:934:7: error: uninitialized record type: 'pIN_binsmore' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:948:7: error: uninitialized record type: 'nSigma_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:954:7: error: uninitialized record type: 'nSigma_binsmore' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:960:7: error: uninitialized record type: 'nSigma_binsgrob' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:966:7: error: uninitialized record type: 'TOFbeta_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:972:7: error: uninitialized record type: 'TPCdEdx_bins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1151:7: error: uninitialized record type: 'PtBinEdges' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1160:7: error: uninitialized record type: 'CentBinEdges' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1207:134: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1208:134: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1254:5: error: uninitialized record type: 'coschiBins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1268:124: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1269:124: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1270:124: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1319:7: error: uninitialized record type: 'massBins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1323:7: error: uninitialized record type: 'ptBins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1354:9: error: uninitialized record type: 'massBins' [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1365:146: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1373:146: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1419:9: error: do not declare C-style arrays, use 'std::array' instead [modernize-avoid-c-arrays,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1425:151: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1426:151: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1427:181: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1428:181: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1435:153: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1436:153: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1437:183: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1438:183: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1445:153: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1446:153: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
PWGDQ/Core/HistogramsLibrary.cxx:1447:183: error: use nullptr [modernize-use-nullptr,-warnings-as-errors]
[0 more errors; see full log]

Full log here.