Add idle session timeout to StreamableHTTPSessionManager #765

Job	Run time
checks / pre-commit	34s
checks / readme-snippets	13s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.11, lowest-direct, windows-latest)	3m 9s
checks / test (3.11, locked, windows-latest)	3m 11s
checks / test (3.13, lowest-direct, ubuntu-latest)	59s
checks / test (3.14, locked, windows-latest)	3m 42s
checks / test (3.12, lowest-direct, windows-latest)	3m 41s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.12, locked, windows-latest)	3m 27s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
checks / test (3.10, lowest-direct, windows-latest)	2m 38s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
checks / test (3.13, locked, windows-latest)	2m 41s
checks / test (3.10, lowest-direct, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.10, locked, windows-latest)	2m 11s
checks / test (3.11, locked, ubuntu-latest)	49s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.12, lowest-direct, ubuntu-latest)	56s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, windows-latest)	2m 33s
all-green	4s
	41m 24s

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