feat: add idle timeout for StreamableHTTP sessions #4151

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	38s
checks / test (3.11, lowest-direct, windows-latest)	3m 1s
checks / test (3.12, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.13, highest, ubuntu-latest)	43s
checks / test (3.10, highest, ubuntu-latest)	47s
checks / test (3.12, highest, windows-latest)	3m 39s
checks / test (3.10, lowest-direct, windows-latest)	2m 35s
checks / test (3.12, highest, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.10, highest, windows-latest)	2m 38s
checks / test (3.11, highest, ubuntu-latest)	46s
checks / test (3.13, highest, windows-latest)	2m 53s
checks / test (3.11, highest, windows-latest)	2m 26s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	2m 40s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
all-green	5s
	30m 41s

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