feat: implement OTEL mcp.server.* metrics #1773

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	38s
checks / test (3.10, lowest-direct, windows-latest)	1m 9s
checks / test (3.11, lowest-direct, windows-latest)	1m 33s
checks / test (3.11, locked, windows-latest)	2m 30s
checks / test (3.10, lowest-direct, ubuntu-latest)	32s
checks / test (3.10, locked, ubuntu-latest)	47s
checks / test (3.10, locked, windows-latest)	2m 22s
checks / test (3.11, lowest-direct, ubuntu-latest)	36s
checks / test (3.12, lowest-direct, ubuntu-latest)	38s
checks / test (3.11, locked, ubuntu-latest)	44s
checks / test (3.14, lowest-direct, ubuntu-latest)	29s
checks / test (3.12, locked, ubuntu-latest)	51s
checks / test (3.13, locked, windows-latest)	2m 36s
checks / test (3.12, locked, windows-latest)	3m 22s
checks / test (3.14, locked, windows-latest)	3m 14s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.14, lowest-direct, windows-latest)	56s
checks / test (3.12, lowest-direct, windows-latest)	1m 12s
checks / test (3.13, lowest-direct, ubuntu-latest)	32s
checks / test (3.14, locked, ubuntu-latest)	2m 26s
checks / test (3.13, lowest-direct, windows-latest)	1m 21s
all-green	3s
	29m 28s

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