feat: add MCP proxy pattern convenience function #3704

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	34s
checks / test (3.10, lowest-direct, ubuntu-latest)	37s
checks / test (3.10, lowest-direct, windows-latest)	1m 47s
checks / test (3.10, highest, ubuntu-latest)	39s
checks / test (3.10, highest, windows-latest)	1m 55s
checks / test (3.11, highest, windows-latest)	2m 28s
checks / test (3.11, lowest-direct, ubuntu-latest)	40s
checks / test (3.11, lowest-direct, windows-latest)	2m 5s
checks / test (3.11, highest, ubuntu-latest)	37s
checks / test (3.12, lowest-direct, ubuntu-latest)	39s
checks / test (3.12, highest, windows-latest)	3m 12s
checks / test (3.12, highest, ubuntu-latest)	43s
checks / test (3.13, highest, ubuntu-latest)	39s
checks / test (3.13, lowest-direct, ubuntu-latest)	41s
checks / test (3.13, lowest-direct, windows-latest)	1m 56s
checks / test (3.13, highest, windows-latest)	2m 9s
checks / test (3.12, lowest-direct, windows-latest)	3m 13s
	24m 48s

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