feat: add idle timeout for StreamableHTTP sessions #4156

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	34s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, highest, windows-latest)	2m 23s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, windows-latest)	2m 54s
checks / test (3.13, highest, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, windows-latest)	2m 14s
checks / test (3.12, highest, ubuntu-latest)	56s
checks / test (3.11, highest, windows-latest)	3m 13s
checks / test (3.13, highest, windows-latest)	2m 55s
checks / test (3.12, lowest-direct, windows-latest)	3m 37s
checks / test (3.12, highest, windows-latest)	3m 49s
checks / test (3.11, lowest-direct, windows-latest)	2m 34s
checks / test (3.11, highest, ubuntu-latest)	49s
all-green	5s
	31m 0s

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