feat: add idle timeout for StreamableHTTP sessions #4142

Job	Run time
checks / readme-snippets	8s
checks / pre-commit	12s
checks / test (3.10, highest, ubuntu-latest)	48s
checks / test (3.10, highest, windows-latest)	2m 14s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, highest, windows-latest)	3m 29s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, windows-latest)	3m 39s
checks / test (3.13, lowest-direct, windows-latest)	2m 19s
checks / test (3.11, lowest-direct, ubuntu-latest)	42s
checks / test (3.13, highest, windows-latest)	2m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.11, highest, ubuntu-latest)	47s
checks / test (3.11, highest, windows-latest)	2m 47s
checks / test (3.11, lowest-direct, windows-latest)	2m 25s
checks / test (3.10, lowest-direct, windows-latest)	2m 31s
checks / test (3.13, highest, ubuntu-latest)	48s
checks / test (3.12, highest, ubuntu-latest)	52s
all-green	4s
	28m 35s

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