refactor: introduce MCPModel base class for protocol types #4105

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	35s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
checks / test (3.10, highest, ubuntu-latest)	43s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, lowest-direct, windows-latest)	2m 14s
checks / test (3.13, highest, windows-latest)	2m 27s
checks / test (3.12, highest, windows-latest)	3m 22s
checks / test (3.13, lowest-direct, windows-latest)	2m 54s
checks / test (3.11, highest, windows-latest)	2m 35s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, highest, ubuntu-latest)	51s
checks / test (3.14, highest, ubuntu-latest)	1m 13s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, highest, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.10, lowest-direct, ubuntu-latest)	49s
checks / test (3.11, highest, ubuntu-latest)	49s
checks / test (3.14, lowest-direct, windows-latest)	2m 21s
checks / test (3.10, highest, windows-latest)	2m 52s
checks / test (3.14, highest, windows-latest)	2m 22s
checks / test (3.12, lowest-direct, windows-latest)	3m 22s
	36m 23s

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