Add idle session timeout to StreamableHTTPSessionManager #735

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	39s
checks / test (3.11, lowest-direct, windows-latest)	2m 38s
checks / test (3.12, locked, ubuntu-latest)	1m 4s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.10, locked, windows-latest)	2m 16s
checks / test (3.12, locked, windows-latest)	3m 17s
checks / test (3.10, lowest-direct, windows-latest)	2m 23s
checks / test (3.12, lowest-direct, windows-latest)	3m 45s
checks / test (3.13, lowest-direct, windows-latest)	3m 13s
checks / test (3.11, locked, windows-latest)	2m 21s
checks / test (3.13, lowest-direct, ubuntu-latest)	57s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.13, locked, windows-latest)	2m 34s
checks / test (3.10, lowest-direct, ubuntu-latest)	51s
checks / test (3.14, locked, windows-latest)	3m 25s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.14, lowest-direct, windows-latest)	2m 25s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
all-green	4s
	40m 14s

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