Add ergonomic Client class for testing MCP servers #122

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	32s
checks / test (3.10, locked, windows-latest)	2m 22s
checks / test (3.11, lowest-direct, windows-latest)	2m 35s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.10, lowest-direct, windows-latest)	2m 29s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.13, locked, windows-latest)	2m 22s
checks / test (3.11, locked, windows-latest)	3m 14s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.12, lowest-direct, windows-latest)	3m 29s
checks / test (3.12, locked, windows-latest)	3m 47s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.14, lowest-direct, windows-latest)	2m 39s
checks / test (3.13, lowest-direct, windows-latest)	2m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.14, locked, windows-latest)	3m 8s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.12, locked, ubuntu-latest)	53s
all-green	4s
	39m 9s

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