feat: implement OTEL mcp.server.* metrics #1771

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	19s
checks / test (3.11, lowest-direct, ubuntu-latest)	33s
checks / test (3.12, lowest-direct, windows-latest)	1m 3s
checks / test (3.11, lowest-direct, windows-latest)	1m 58s
checks / test (3.10, lowest-direct, windows-latest)	1m 19s
checks / test (3.12, lowest-direct, ubuntu-latest)	40s
checks / test (3.10, lowest-direct, ubuntu-latest)	33s
checks / test (3.10, locked, windows-latest)	2m 24s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.12, locked, windows-latest)	3m 11s
checks / test (3.14, lowest-direct, ubuntu-latest)	28s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.11, locked, windows-latest)	2m 56s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
checks / test (3.13, lowest-direct, windows-latest)	1m 13s
checks / test (3.14, locked, windows-latest)	3m 3s
checks / test (3.13, lowest-direct, ubuntu-latest)	38s
checks / test (3.14, lowest-direct, windows-latest)	55s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.13, locked, windows-latest)	2m 37s
all-green	2s
	29m 47s

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