[huytdps13400]

SQLite query metadata assigns the wrong types to declared columns because the native mapper treats unequal type names as matches. This makes most declarations appear as BOOLEAN and makes BOOLEAN appear as NUMBER, which can mislead consumers that use metadata. This change compares declaration names for equality and adds database-backed regression tests for execute() and executeAsync().

The mapping still recognizes only exact BOOLEAN, FLOAT, INTEGER, TEXT, and BLOB declarations. Other declarations, including REAL, DOUBLE, VARCHAR(...), and INT, continue to return NULL_VALUE.

Reproduction

Create a table with columns declared as BOOLEAN, FLOAT, INTEGER, TEXT, and BLOB. Select those columns plus NULL AS null_value, then inspect result.metadata. Before the fix, the boolean column reports NUMBER and the other declared columns report BOOLEAN. After the fix, the six metadata types are BOOLEAN, NUMBER, INT64, TEXT, ARRAY_BUFFER, and NULL_VALUE, respectively.

Closes #305.

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