feat: implement OTEL mcp.server.* metrics #1777

Job	Run time
checks / pre-commit	28s
checks / readme-snippets	14s
checks / test (3.11, lowest-direct, ubuntu-latest)	36s
checks / test (3.11, lowest-direct, windows-latest)	1m 13s
checks / test (3.10, locked, windows-latest)	2m 23s
checks / test (3.10, lowest-direct, windows-latest)	58s
checks / test (3.10, lowest-direct, ubuntu-latest)	40s
checks / test (3.12, lowest-direct, ubuntu-latest)	41s
checks / test (3.11, locked, ubuntu-latest)	55s
checks / test (3.12, locked, windows-latest)	3m 7s
checks / test (3.11, locked, windows-latest)	2m 58s
checks / test (3.14, lowest-direct, windows-latest)	56s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.13, lowest-direct, ubuntu-latest)	33s
checks / test (3.14, lowest-direct, ubuntu-latest)	25s
checks / test (3.10, locked, ubuntu-latest)	55s
checks / test (3.13, locked, ubuntu-latest)	48s
checks / test (3.13, locked, windows-latest)	2m 21s
checks / test (3.13, lowest-direct, windows-latest)	1m 47s
checks / test (3.14, locked, windows-latest)	3m 54s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
checks / test (3.12, lowest-direct, windows-latest)	1m 21s
all-green	2s
	30m 31s

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