feat: add idle timeout for StreamableHTTP sessions #4133

Job	Run time
checks / pre-commit	17s
checks / test (3.10, lowest-direct, ubuntu-latest)	43s
checks / test (3.11, highest, ubuntu-latest)	45s
checks / test (3.10, lowest-direct, windows-latest)	2m 36s
checks / test (3.12, highest, ubuntu-latest)	51s
checks / test (3.12, highest, windows-latest)	3m 28s
checks / test (3.13, lowest-direct, windows-latest)	3m 53s
checks / test (3.10, highest, windows-latest)	2m 32s
checks / test (3.12, lowest-direct, windows-latest)	3m 23s
checks / test (3.10, highest, ubuntu-latest)	43s
checks / test (3.13, highest, windows-latest)	2m 47s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 43s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.12, lowest-direct, ubuntu-latest)	46s
checks / readme-snippets	15s
checks / test (3.13, highest, ubuntu-latest)	43s
checks / test (3.11, highest, windows-latest)	2m 49s
all-green	4s
	30m 44s

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