feat: add idle timeout for StreamableHTTP sessions #4167

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	10s
checks / test (3.12, highest, ubuntu-latest)	50s
checks / test (3.11, highest, ubuntu-latest)	44s
checks / test (3.12, highest, windows-latest)	3m 24s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, windows-latest)	3m 19s
checks / test (3.10, lowest-direct, windows-latest)	2m 18s
checks / test (3.13, highest, ubuntu-latest)	43s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, highest, ubuntu-latest)	45s
checks / test (3.10, highest, windows-latest)	2m 23s
checks / test (3.11, lowest-direct, windows-latest)	2m 54s
checks / test (3.11, highest, windows-latest)	2m 37s
checks / test (3.13, highest, windows-latest)	2m 37s
checks / test (3.13, lowest-direct, windows-latest)	2m 31s
all-green	2s
	29m 2s

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