refactor: introduce MCPModel base class for protocol types (#1880) #565

Job	Run time
checks / pre-commit	30s
checks / readme-snippets	14s
checks / test (3.11, lowest-direct, ubuntu-latest)	50s
checks / test (3.10, highest, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, windows-latest)	2m 24s
checks / test (3.13, lowest-direct, windows-latest)	3m 5s
checks / test (3.14, lowest-direct, windows-latest)	2m 25s
checks / test (3.13, highest, ubuntu-latest)	45s
checks / test (3.11, highest, windows-latest)	2m 49s
checks / test (3.12, highest, ubuntu-latest)	50s
checks / test (3.10, highest, windows-latest)	2m 24s
checks / test (3.14, highest, windows-latest)	2m 33s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, lowest-direct, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, windows-latest)	3m 24s
checks / test (3.10, lowest-direct, windows-latest)	2m 20s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.13, highest, windows-latest)	2m 29s
checks / test (3.14, highest, ubuntu-latest)	1m 15s
checks / test (3.12, highest, windows-latest)	3m 41s
checks / test (3.11, highest, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
	37m 4s

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