feat: implement OTEL mcp.server.* metrics #1772

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	19s
checks / test (3.13, lowest-direct, ubuntu-latest)	32s
checks / test (3.10, lowest-direct, ubuntu-latest)	32s
checks / test (3.12, locked, ubuntu-latest)	50s
checks / test (3.14, lowest-direct, windows-latest)	57s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, ubuntu-latest)	42s
checks / test (3.12, lowest-direct, windows-latest)	1m 1s
checks / test (3.13, lowest-direct, windows-latest)	1m 7s
checks / test (3.13, locked, windows-latest)	2m 26s
checks / test (3.14, lowest-direct, ubuntu-latest)	29s
checks / test (3.11, lowest-direct, ubuntu-latest)	35s
checks / test (3.14, locked, windows-latest)	3m 3s
checks / test (3.10, lowest-direct, windows-latest)	56s
checks / test (3.11, lowest-direct, windows-latest)	1m 8s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.11, locked, windows-latest)	2m 30s
checks / test (3.10, locked, windows-latest)	2m 26s
checks / test (3.14, locked, ubuntu-latest)	2m 22s
checks / test (3.12, locked, windows-latest)	3m 40s
checks / test (3.13, locked, ubuntu-latest)	42s
all-green	4s
	28m 8s

Provide feedback