feat: add idle timeout for StreamableHTTP sessions #4147

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	32s
checks / test (3.12, highest, ubuntu-latest)	49s
checks / test (3.11, highest, windows-latest)	2m 31s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.11, highest, ubuntu-latest)	49s
checks / test (3.10, lowest-direct, windows-latest)	2m 16s
checks / test (3.11, lowest-direct, ubuntu-latest)	43s
checks / test (3.13, highest, ubuntu-latest)	43s
checks / test (3.13, lowest-direct, windows-latest)	2m 17s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.10, highest, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, windows-latest)	2m 18s
checks / test (3.12, lowest-direct, windows-latest)	3m 16s
checks / test (3.10, highest, windows-latest)	2m 36s
checks / test (3.13, highest, windows-latest)	2m 14s
checks / test (3.12, highest, windows-latest)	3m 33s
all-green	2s
	28m 7s

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