Add idle session timeout to StreamableHTTPSessionManager #723

Job	Run time
checks / pre-commit	37s
checks / readme-snippets	15s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.12, locked, ubuntu-latest)	59s
checks / test (3.11, locked, windows-latest)	3m 5s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.10, lowest-direct, windows-latest)	2m 22s
checks / test (3.12, lowest-direct, windows-latest)	3m 29s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
checks / test (3.14, locked, windows-latest)	3m 8s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.10, locked, windows-latest)	2m 4s
checks / test (3.11, lowest-direct, windows-latest)	2m 41s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.13, locked, windows-latest)	3m 11s
checks / test (3.10, lowest-direct, ubuntu-latest)	54s
checks / test (3.12, locked, windows-latest)	3m 13s
checks / test (3.13, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	2m 30s
checks / test (3.13, locked, ubuntu-latest)	48s
checks / test (3.14, lowest-direct, windows-latest)	2m 6s
checks / test (3.11, lowest-direct, ubuntu-latest)	59s
all-green	5s
	39m 43s

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