Send SEP-2243 Mcp-Method/Mcp-Name headers from the StreamableHTTP client #3419

Job	Run time
checks / docs	44s
checks / pre-commit	53s
checks / readme-snippets	12s
checks / test (3.10, locked, ubuntu-latest)	1m 8s
checks / test (3.11, lowest-direct, windows-latest)	1m 52s
checks / test (3.13, lowest-direct, windows-latest)	2m 3s
checks / test (3.14, lowest-direct, windows-latest)	1m 47s
checks / test (3.13, locked, ubuntu-latest)	1m 0s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.14, locked, windows-latest)	2m 53s
checks / test (3.12, lowest-direct, windows-latest)	1m 51s
checks / test (3.11, locked, ubuntu-latest)	1m 7s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.13, locked, windows-latest)	1m 52s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.10, locked, windows-latest)	1m 50s
checks / test (3.12, locked, ubuntu-latest)	1m 22s
checks / test (3.12, locked, windows-latest)	1m 47s
checks / test (3.14, locked, ubuntu-latest)	2m 4s
checks / test (3.11, locked, windows-latest)	1m 46s
checks / test (3.10, lowest-direct, windows-latest)	1m 43s
checks / test (3.14, lowest-direct, ubuntu-latest)	55s
all-green	5s
	33m 15s

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