feat: add idle timeout for StreamableHTTP sessions #4158

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	35s
checks / test (3.11, lowest-direct, windows-latest)	2m 37s
checks / test (3.11, highest, ubuntu-latest)	50s
checks / test (3.12, highest, windows-latest)	3m 45s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.11, highest, windows-latest)	2m 33s
checks / test (3.12, highest, ubuntu-latest)	55s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, highest, windows-latest)	2m 26s
checks / test (3.12, lowest-direct, windows-latest)	3m 16s
checks / test (3.13, highest, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, windows-latest)	2m 28s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.13, highest, windows-latest)	2m 38s
checks / test (3.13, lowest-direct, windows-latest)	2m 36s
all-green	3s
	29m 41s

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