Add idle session timeout to StreamableHTTPSessionManager #584

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	4m 45s
checks / test (3.10, lowest-direct, ubuntu-latest)	58s
checks / test (3.11, lowest-direct, ubuntu-latest)	5m 54s
checks / test (3.10, locked, ubuntu-latest)	3m 42s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 17s
checks / test (3.13, lowest-direct, ubuntu-latest)	51s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, windows-latest)	3m 15s
checks / test (3.10, locked, windows-latest)	4m 48s
checks / test (3.11, locked, windows-latest)	2m 21s
checks / test (3.11, locked, ubuntu-latest)	2m 49s
checks / test (3.12, lowest-direct, windows-latest)	6m 57s
checks / test (3.10, lowest-direct, windows-latest)	7m 29s
checks / test (3.13, locked, windows-latest)	2m 23s
checks / test (3.13, lowest-direct, windows-latest)	4m 42s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.12, locked, windows-latest)	3m 8s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.14, locked, windows-latest)	5m 19s
checks / test (3.14, lowest-direct, windows-latest)	6m 31s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
all-green	4s
	1h 12m 23s

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