Add a pluggable server extension API with MCP Apps #3156

Job	Run time
checks / pre-commit	49s
checks / readme-snippets	11s
checks / docs	40s
checks / test (3.10, locked, ubuntu-latest)	1m 12s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.10, lowest-direct, windows-latest)	1m 38s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.10, locked, windows-latest)	1m 56s
checks / test (3.11, lowest-direct, windows-latest)	1m 54s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.12, locked, windows-latest)	1m 46s
checks / test (3.13, lowest-direct, windows-latest)	1m 42s
checks / test (3.11, locked, ubuntu-latest)	1m 8s
checks / test (3.11, locked, windows-latest)	1m 59s
checks / test (3.12, locked, ubuntu-latest)	1m 26s
checks / test (3.12, lowest-direct, windows-latest)	1m 42s
checks / test (3.13, locked, ubuntu-latest)	1m 7s
checks / test (3.14, locked, windows-latest)	2m 29s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.14, locked, ubuntu-latest)	2m 6s
checks / test (3.14, lowest-direct, windows-latest)	1m 58s
checks / test (3.13, locked, windows-latest)	1m 52s
all-green	6s
	33m 43s

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