feat: add idle timeout for StreamableHTTP sessions #4143

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	31s
checks / test (3.11, highest, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, highest, windows-latest)	2m 38s
checks / test (3.12, lowest-direct, windows-latest)	3m 50s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.10, lowest-direct, windows-latest)	2m 3s
checks / test (3.10, highest, windows-latest)	2m 33s
checks / test (3.10, highest, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, windows-latest)	2m 37s
checks / test (3.13, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, highest, windows-latest)	3m 14s
checks / test (3.13, highest, windows-latest)	2m 18s
checks / test (3.13, highest, ubuntu-latest)	44s
checks / test (3.13, lowest-direct, ubuntu-latest)	43s
checks / test (3.12, highest, ubuntu-latest)	50s
checks / test (3.12, lowest-direct, ubuntu-latest)	47s
all-green	3s
	28m 41s

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