Send SEP-2243 Mcp-Method/Mcp-Name headers from the StreamableHTTP client #2375

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	29s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.10, locked, ubuntu-latest)	1m 7s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.11, locked, ubuntu-latest)	1m 3s
checks / test (3.13, locked, ubuntu-latest)	58s
checks / test (3.13, locked, windows-latest)	3m 15s
checks / test (3.14, locked, ubuntu-latest)	2m 29s
checks / test (3.13, lowest-direct, windows-latest)	2m 25s
checks / test (3.11, locked, windows-latest)	13s
checks / test (3.12, locked, windows-latest)	3m 54s
checks / test (3.12, locked, ubuntu-latest)	1m 7s
checks / test (3.10, lowest-direct, windows-latest)	2m 43s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.13, lowest-direct, ubuntu-latest)	59s
checks / test (3.10, locked, windows-latest)	2m 44s
checks / test (3.12, lowest-direct, windows-latest)	4m 6s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.14, locked, windows-latest)	3m 13s
checks / test (3.14, lowest-direct, windows-latest)	2m 38s
all-green	4s
	41m 6s

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