feat: implement OTEL mcp.server.* metrics #1779

Job	Run time
checks / pre-commit	35s
checks / readme-snippets	16s
checks / test (3.11, lowest-direct, windows-latest)	2m 32s
checks / test (3.10, locked, windows-latest)	2m 56s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, lowest-direct, windows-latest)	3m 41s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, windows-latest)	2m 18s
checks / test (3.11, lowest-direct, ubuntu-latest)	42s
checks / test (3.13, lowest-direct, windows-latest)	3m 12s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.14, lowest-direct, windows-latest)	2m 24s
checks / test (3.11, locked, windows-latest)	2m 30s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, locked, windows-latest)	3m 28s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.13, locked, windows-latest)	2m 47s
checks / test (3.14, locked, windows-latest)	3m 12s
all-green	4s
	39m 48s

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