Add ergonomic Client class for testing MCP servers #132

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	33s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, locked, windows-latest)	2m 18s
checks / test (3.11, lowest-direct, windows-latest)	2m 30s
checks / test (3.10, lowest-direct, windows-latest)	3m 6s
checks / test (3.12, lowest-direct, windows-latest)	3m 40s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.13, locked, windows-latest)	2m 23s
checks / test (3.12, locked, ubuntu-latest)	51s
checks / test (3.11, locked, windows-latest)	2m 37s
checks / test (3.12, locked, windows-latest)	3m 42s
checks / test (3.13, lowest-direct, windows-latest)	2m 24s
checks / test (3.14, lowest-direct, windows-latest)	2m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, locked, ubuntu-latest)	42s
checks / test (3.14, locked, windows-latest)	3m 44s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
all-green	4s
	39m 32s

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