Split protocol types into a standalone `mcp-types` package #2994

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	50s
checks / test (3.12, lowest-direct, windows-latest)	1m 36s
checks / test (3.10, locked, ubuntu-latest)	1m 6s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.13, locked, windows-latest)	1m 30s
checks / test (3.11, lowest-direct, windows-latest)	1m 31s
checks / test (3.10, locked, windows-latest)	1m 40s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.13, locked, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.14, locked, ubuntu-latest)	2m 6s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.12, locked, windows-latest)	1m 38s
checks / test (3.13, lowest-direct, ubuntu-latest)	59s
checks / test (3.14, locked, windows-latest)	3m 1s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.14, lowest-direct, windows-latest)	1m 38s
checks / test (3.12, locked, ubuntu-latest)	1m 6s
checks / test (3.13, lowest-direct, windows-latest)	1m 29s
checks / test (3.11, locked, windows-latest)	1m 29s
checks / test (3.10, lowest-direct, windows-latest)	1m 34s
all-green	3s
	29m 35s

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