feat: add idle timeout for StreamableHTTP sessions #4163

Job	Run time
checks / readme-snippets	15s
checks / pre-commit	30s
checks / test (3.10, lowest-direct, ubuntu-latest)	42s
checks / test (3.10, lowest-direct, windows-latest)	2m 34s
checks / test (3.13, highest, windows-latest)	2m 33s
checks / test (3.12, highest, ubuntu-latest)	55s
checks / test (3.11, highest, ubuntu-latest)	44s
checks / test (3.12, lowest-direct, windows-latest)	3m 33s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.12, lowest-direct, ubuntu-latest)	52s
checks / test (3.10, highest, windows-latest)	2m 25s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, highest, windows-latest)	3m 38s
checks / test (3.10, highest, ubuntu-latest)	44s
checks / test (3.11, highest, windows-latest)	2m 46s
checks / test (3.13, highest, ubuntu-latest)	44s
checks / test (3.13, lowest-direct, windows-latest)	2m 44s
all-green	3s
	29m 48s

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