feat: implement OTEL mcp.server.* metrics #1774

Job	Run time
checks / readme-snippets	16s
checks / pre-commit	23s
checks / test (3.10, locked, ubuntu-latest)	47s
checks / test (3.11, lowest-direct, windows-latest)	1m 11s
checks / test (3.10, lowest-direct, windows-latest)	1m 4s
checks / test (3.11, lowest-direct, ubuntu-latest)	32s
checks / test (3.10, lowest-direct, ubuntu-latest)	33s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.10, locked, windows-latest)	2m 46s
checks / test (3.12, lowest-direct, ubuntu-latest)	42s
checks / test (3.13, lowest-direct, ubuntu-latest)	35s
checks / test (3.12, lowest-direct, windows-latest)	1m 22s
checks / test (3.14, lowest-direct, ubuntu-latest)	26s
checks / test (3.12, locked, windows-latest)	3m 12s
checks / test (3.12, locked, ubuntu-latest)	51s
checks / test (3.14, locked, windows-latest)	3m 19s
checks / test (3.14, lowest-direct, windows-latest)	57s
checks / test (3.13, locked, windows-latest)	2m 34s
checks / test (3.14, locked, ubuntu-latest)	2m 22s
checks / test (3.13, lowest-direct, windows-latest)	1m 15s
checks / test (3.11, locked, windows-latest)	2m 42s
all-green	5s
	29m 28s

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