feat: add idle timeout for StreamableHTTP sessions #4157

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	38s
checks / test (3.12, lowest-direct, windows-latest)	3m 30s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, highest, windows-latest)	3m 43s
checks / test (3.13, highest, windows-latest)	2m 42s
checks / test (3.11, highest, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.12, highest, ubuntu-latest)	55s
checks / test (3.11, highest, windows-latest)	2m 29s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, windows-latest)	2m 16s
checks / test (3.10, lowest-direct, windows-latest)	3m 5s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, highest, windows-latest)	2m 23s
checks / test (3.13, highest, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, windows-latest)	2m 28s
checks / test (3.13, lowest-direct, ubuntu-latest)	48s
all-green	4s
	30m 2s

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