Add GenAI semantic-convention attributes to OpenTelemetryMiddleware #2977

Job	Run time
checks / pre-commit	40s
checks / test (3.10, locked, windows-latest)	1m 37s
checks / test (3.11, lowest-direct, windows-latest)	2m 19s
checks / test (3.13, lowest-direct, windows-latest)	1m 44s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.12, locked, windows-latest)	1m 34s
checks / readme-snippets	11s
checks / test (3.13, locked, ubuntu-latest)	56s
checks / test (3.10, locked, ubuntu-latest)	1m 3s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.11, locked, windows-latest)	1m 50s
checks / test (3.12, lowest-direct, windows-latest)	2m 7s
checks / test (3.10, lowest-direct, windows-latest)	1m 37s
checks / test (3.14, locked, ubuntu-latest)	2m 6s
checks / test (3.12, locked, ubuntu-latest)	1m 9s
checks / test (3.14, lowest-direct, windows-latest)	1m 28s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.13, locked, windows-latest)	1m 24s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.11, locked, ubuntu-latest)	1m 1s
checks / test (3.14, locked, windows-latest)	2m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	46s
all-green	3s
	30m 33s

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