feat: implement OTEL mcp.server.* metrics #1778

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	33s
checks / test (3.11, lowest-direct, windows-latest)	1m 30s
checks / test (3.11, lowest-direct, ubuntu-latest)	31s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.12, locked, windows-latest)	3m 15s
checks / test (3.10, locked, windows-latest)	2m 24s
checks / test (3.10, lowest-direct, windows-latest)	1m 10s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.13, locked, windows-latest)	2m 28s
checks / test (3.11, locked, ubuntu-latest)	49s
checks / test (3.14, lowest-direct, ubuntu-latest)	25s
checks / test (3.13, lowest-direct, ubuntu-latest)	34s
checks / test (3.10, lowest-direct, ubuntu-latest)	37s
checks / test (3.12, lowest-direct, ubuntu-latest)	41s
checks / test (3.13, lowest-direct, windows-latest)	1m 14s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.14, lowest-direct, windows-latest)	47s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
checks / test (3.12, lowest-direct, windows-latest)	1m 0s
checks / test (3.14, locked, windows-latest)	3m 4s
checks / test (3.11, locked, windows-latest)	2m 34s
all-green	3s
	28m 51s

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