feat: add idle timeout for StreamableHTTP sessions #4159

Job	Run time
checks / pre-commit	31s
checks / readme-snippets	14s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, windows-latest)	2m 44s
checks / test (3.10, lowest-direct, windows-latest)	2m 45s
checks / test (3.13, highest, windows-latest)	2m 53s
checks / test (3.12, highest, ubuntu-latest)	59s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, highest, ubuntu-latest)	49s
checks / test (3.11, highest, ubuntu-latest)	45s
checks / test (3.10, highest, windows-latest)	2m 25s
checks / test (3.12, highest, windows-latest)	3m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, highest, windows-latest)	2m 36s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	2m 40s
checks / test (3.12, lowest-direct, windows-latest)	3m 30s
checks / test (3.13, highest, ubuntu-latest)	46s
all-green	5s
	30m 21s

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