Add idle session timeout to StreamableHTTPSessionManager #729

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	12s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.10, locked, windows-latest)	2m 27s
checks / test (3.11, lowest-direct, windows-latest)	2m 42s
checks / test (3.11, locked, windows-latest)	2m 19s
checks / test (3.12, locked, ubuntu-latest)	1m 1s
checks / test (3.12, lowest-direct, windows-latest)	3m 33s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.13, lowest-direct, windows-latest)	3m 7s
checks / test (3.13, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, locked, windows-latest)	3m 13s
checks / test (3.14, locked, ubuntu-latest)	2m 28s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.14, locked, windows-latest)	3m 14s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, windows-latest)	2m 26s
checks / test (3.13, locked, windows-latest)	3m 19s
checks / test (3.10, lowest-direct, windows-latest)	2m 35s
all-green	4s
	40m 23s

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