feat: add idle timeout for StreamableHTTP sessions #4146

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	31s
checks / test (3.10, lowest-direct, windows-latest)	2m 42s
checks / test (3.12, highest, windows-latest)	3m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	43s
checks / test (3.10, highest, windows-latest)	2m 17s
checks / test (3.11, highest, windows-latest)	2m 31s
checks / test (3.13, highest, windows-latest)	2m 44s
checks / test (3.12, lowest-direct, windows-latest)	3m 10s
checks / test (3.11, highest, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	2m 59s
checks / test (3.12, lowest-direct, ubuntu-latest)	53s
checks / test (3.10, highest, ubuntu-latest)	51s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, highest, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, highest, ubuntu-latest)	50s
checks / test (3.11, lowest-direct, windows-latest)	2m 24s
all-green	2s
	29m 21s

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