refactor: introduce MCPModel base class for protocol types #4104

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	31s
checks / test (3.10, lowest-direct, windows-latest)	2m 20s
checks / test (3.12, lowest-direct, windows-latest)	3m 18s
checks / test (3.11, highest, windows-latest)	2m 28s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, highest, windows-latest)	3m 22s
checks / test (3.13, highest, windows-latest)	2m 31s
checks / test (3.11, highest, ubuntu-latest)	48s
checks / test (3.10, highest, windows-latest)	2m 22s
checks / test (3.14, highest, windows-latest)	2m 18s
checks / test (3.11, lowest-direct, windows-latest)	2m 35s
checks / test (3.12, highest, ubuntu-latest)	51s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.10, highest, ubuntu-latest)	44s
checks / test (3.13, highest, ubuntu-latest)	47s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, lowest-direct, windows-latest)	2m 28s
checks / test (3.14, lowest-direct, windows-latest)	2m 15s
checks / test (3.14, highest, ubuntu-latest)	1m 8s
	35m 17s

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