Add idle session timeout to StreamableHTTPSessionManager #720

Job	Run time
checks / pre-commit	31s
checks / readme-snippets	10s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, windows-latest)	2m 23s
checks / test (3.11, lowest-direct, windows-latest)	2m 41s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.11, locked, windows-latest)	2m 29s
checks / test (3.10, locked, windows-latest)	2m 13s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.11, locked, ubuntu-latest)	43s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.14, locked, ubuntu-latest)	2m 15s
checks / test (3.13, locked, windows-latest)	2m 54s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, locked, windows-latest)	3m 14s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.14, lowest-direct, windows-latest)	2m 24s
checks / test (3.13, locked, ubuntu-latest)	41s
checks / test (3.14, locked, windows-latest)	3m 5s
checks / test (3.13, lowest-direct, windows-latest)	2m 44s
checks / test (3.10, locked, ubuntu-latest)	45s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
all-green	4s
	37m 59s

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