feat: add idle timeout for StreamableHTTP sessions #4165

Job	Run time
checks / pre-commit	37s
checks / test (3.11, lowest-direct, windows-latest)	2m 34s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, lowest-direct, windows-latest)	2m 19s
checks / readme-snippets	11s
checks / test (3.11, highest, windows-latest)	2m 35s
checks / test (3.13, lowest-direct, windows-latest)	2m 31s
checks / test (3.13, highest, windows-latest)	2m 53s
checks / test (3.13, lowest-direct, ubuntu-latest)	47s
checks / test (3.10, highest, windows-latest)	2m 27s
checks / test (3.11, highest, ubuntu-latest)	44s
checks / test (3.12, highest, windows-latest)	3m 20s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.12, highest, ubuntu-latest)	54s
checks / test (3.13, highest, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	3m 25s
all-green	3s
	29m 16s

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