feat: add MCP proxy pattern convenience function #3694

Job	Run time
checks / readme-snippets	9s
checks / pre-commit	20s
checks / test (3.10, highest, windows-latest)	1m 57s
checks / test (3.10, highest, ubuntu-latest)	34s
checks / test (3.10, lowest-direct, ubuntu-latest)	38s
checks / test (3.10, lowest-direct, windows-latest)	2m 11s
checks / test (3.11, lowest-direct, windows-latest)	2m 7s
checks / test (3.11, lowest-direct, ubuntu-latest)	34s
checks / test (3.12, lowest-direct, ubuntu-latest)	39s
checks / test (3.12, lowest-direct, windows-latest)	2m 45s
checks / test (3.12, highest, ubuntu-latest)	40s
checks / test (3.12, highest, windows-latest)	3m 21s
checks / test (3.11, highest, windows-latest)	2m 14s
checks / test (3.11, highest, ubuntu-latest)	35s
checks / test (3.13, highest, ubuntu-latest)	37s
checks / test (3.13, lowest-direct, windows-latest)	1m 58s
checks / test (3.13, lowest-direct, ubuntu-latest)	33s
checks / test (3.13, highest, windows-latest)	3m 48s
	25m 40s

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