feat: add idle timeout for StreamableHTTP sessions #4162

Job	Run time
checks / pre-commit	30s
checks / readme-snippets	14s
checks / test (3.11, lowest-direct, windows-latest)	2m 27s
checks / test (3.13, lowest-direct, windows-latest)	2m 28s
checks / test (3.11, highest, windows-latest)	2m 36s
checks / test (3.12, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, highest, ubuntu-latest)	45s
checks / test (3.10, highest, windows-latest)	2m 55s
checks / test (3.10, lowest-direct, windows-latest)	2m 33s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, highest, ubuntu-latest)	49s
checks / test (3.13, highest, windows-latest)	2m 38s
checks / test (3.12, lowest-direct, windows-latest)	3m 26s
checks / test (3.12, highest, ubuntu-latest)	53s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, highest, windows-latest)	3m 51s
checks / test (3.13, lowest-direct, ubuntu-latest)	48s
all-green	3s
	30m 9s

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