Add idle session timeout to StreamableHTTPSessionManager #733

Job	Run time
checks / pre-commit	34s
checks / readme-snippets	14s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, locked, windows-latest)	3m 2s
checks / test (3.12, lowest-direct, windows-latest)	4m 14s
checks / test (3.12, locked, ubuntu-latest)	56s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.14, lowest-direct, windows-latest)	2m 22s
checks / test (3.13, locked, windows-latest)	2m 30s
checks / test (3.10, lowest-direct, windows-latest)	2m 25s
checks / test (3.10, locked, windows-latest)	2m 14s
checks / test (3.13, lowest-direct, windows-latest)	2m 26s
checks / test (3.14, locked, ubuntu-latest)	2m 20s
checks / test (3.10, locked, ubuntu-latest)	55s
checks / test (3.11, lowest-direct, ubuntu-latest)	50s
checks / test (3.11, locked, windows-latest)	2m 21s
checks / test (3.10, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, locked, windows-latest)	3m 19s
checks / test (3.11, lowest-direct, windows-latest)	2m 44s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.11, locked, ubuntu-latest)	51s
all-green	3s
	39m 12s

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