Add ergonomic Client class for testing MCP servers #131

Job	Run time
checks / pre-commit	37s
checks / readme-snippets	10s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.10, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, locked, ubuntu-latest)	43s
checks / test (3.14, lowest-direct, windows-latest)	2m 16s
checks / test (3.13, locked, windows-latest)	2m 24s
checks / test (3.12, locked, windows-latest)	3m 26s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.11, lowest-direct, windows-latest)	2m 33s
checks / test (3.12, lowest-direct, ubuntu-latest)	53s
checks / test (3.10, lowest-direct, windows-latest)	2m 16s
checks / test (3.11, locked, windows-latest)	2m 34s
checks / test (3.10, locked, windows-latest)	2m 26s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, lowest-direct, windows-latest)	3m 21s
checks / test (3.14, locked, windows-latest)	3m 59s
checks / test (3.14, locked, ubuntu-latest)	2m 22s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.12, locked, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, windows-latest)	2m 26s
checks / test (3.10, locked, ubuntu-latest)	47s
all-green	5s
	38m 13s

Provide feedback