Add idle session timeout to StreamableHTTPSessionManager #722

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	34s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.12, locked, ubuntu-latest)	58s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.12, lowest-direct, windows-latest)	4m 0s
checks / test (3.10, lowest-direct, windows-latest)	2m 12s
checks / test (3.13, locked, ubuntu-latest)	48s
checks / test (3.10, locked, windows-latest)	2m 8s
checks / test (3.10, lowest-direct, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.11, locked, windows-latest)	2m 32s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.13, locked, windows-latest)	2m 13s
checks / test (3.14, locked, windows-latest)	3m 5s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
checks / test (3.11, lowest-direct, ubuntu-latest)	56s
checks / test (3.13, lowest-direct, windows-latest)	2m 35s
checks / test (3.13, lowest-direct, ubuntu-latest)	52s
checks / test (3.14, locked, ubuntu-latest)	2m 14s
checks / test (3.12, locked, windows-latest)	3m 18s
all-green	15s
	38m 20s

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