Add a pluggable server extension API with MCP Apps (#3003) #3178

Job	Run time
checks / docs	36s
checks / readme-snippets	14s
checks / pre-commit	1m 2s
checks / test (3.11, lowest-direct, windows-latest)	2m 19s
checks / test (3.10, lowest-direct, windows-latest)	1m 48s
checks / test (3.14, locked, ubuntu-latest)	2m 10s
checks / test (3.10, locked, windows-latest)	2m 5s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.13, lowest-direct, windows-latest)	2m 10s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.12, locked, windows-latest)	1m 55s
checks / test (3.11, locked, ubuntu-latest)	1m 13s
checks / test (3.12, locked, ubuntu-latest)	1m 27s
checks / test (3.10, locked, ubuntu-latest)	1m 14s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.11, locked, windows-latest)	1m 43s
checks / test (3.12, lowest-direct, windows-latest)	1m 51s
checks / test (3.14, lowest-direct, windows-latest)	1m 42s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.13, locked, windows-latest)	1m 54s
checks / test (3.13, locked, ubuntu-latest)	1m 6s
checks / test (3.14, locked, windows-latest)	2m 36s
all-green	2s
	35m 7s

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