feat: add idle timeout for StreamableHTTP sessions #4144

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	14s
checks / test (3.10, lowest-direct, windows-latest)	2m 9s
checks / test (3.13, lowest-direct, windows-latest)	2m 33s
checks / test (3.12, highest, ubuntu-latest)	47s
checks / test (3.11, highest, windows-latest)	2m 25s
checks / test (3.11, highest, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, windows-latest)	3m 18s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.13, highest, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, ubuntu-latest)	42s
checks / test (3.13, highest, windows-latest)	2m 41s
checks / test (3.10, highest, windows-latest)	2m 16s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, highest, windows-latest)	3m 32s
all-green	2s
	28m 33s

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