Add ergonomic Client class for testing MCP servers #116

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	36s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, locked, windows-latest)	3m 10s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.12, locked, windows-latest)	3m 20s
checks / test (3.14, locked, ubuntu-latest)	2m 16s
checks / test (3.11, lowest-direct, windows-latest)	3m 34s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.10, lowest-direct, windows-latest)	2m 36s
checks / test (3.14, locked, windows-latest)	3m 12s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.13, lowest-direct, windows-latest)	2m 24s
checks / test (3.12, lowest-direct, windows-latest)	3m 23s
checks / test (3.10, locked, windows-latest)	2m 31s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.14, lowest-direct, windows-latest)	2m 21s
checks / test (3.13, locked, windows-latest)	2m 59s
all-green	5s
	40m 16s

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