Add idle session timeout to StreamableHTTPSessionManager #721

Job	Run time
checks / pre-commit	32s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, windows-latest)	2m 31s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.10, locked, windows-latest)	2m 2s
checks / test (3.10, lowest-direct, windows-latest)	2m 32s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.11, locked, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, windows-latest)	2m 22s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.12, locked, ubuntu-latest)	58s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 25s
checks / test (3.14, locked, ubuntu-latest)	2m 25s
checks / test (3.12, lowest-direct, windows-latest)	3m 33s
checks / test (3.14, lowest-direct, windows-latest)	2m 38s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, locked, windows-latest)	2m 23s
checks / test (3.14, locked, windows-latest)	3m 16s
checks / test (3.13, lowest-direct, ubuntu-latest)	56s
checks / test (3.12, locked, windows-latest)	4m 8s
checks / test (3.13, locked, windows-latest)	2m 22s
checks / test (3.13, locked, ubuntu-latest)	47s
all-green	4s
	39m 43s

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