feat: add idle timeout for StreamableHTTP sessions #4161

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	12s
checks / test (3.12, lowest-direct, windows-latest)	3m 26s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, highest, windows-latest)	2m 34s
checks / test (3.11, highest, ubuntu-latest)	45s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, highest, windows-latest)	2m 32s
checks / test (3.12, lowest-direct, ubuntu-latest)	53s
checks / test (3.13, lowest-direct, windows-latest)	2m 17s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, highest, windows-latest)	3m 34s
checks / test (3.12, highest, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, windows-latest)	3m 8s
checks / test (3.13, highest, ubuntu-latest)	50s
checks / test (3.10, highest, windows-latest)	2m 32s
checks / test (3.10, lowest-direct, windows-latest)	2m 25s
all-green	4s
	29m 48s

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