fix(streamable-http): expose session_idle_timeout and pause idle reaping during active requests #1880

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	35s
checks / test (3.10, lowest-direct, windows-latest)	2m 53s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.11, locked, ubuntu-latest)	54s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.12, locked, windows-latest)	3m 30s
checks / test (3.12, locked, ubuntu-latest)	1m 0s
checks / test (3.11, locked, windows-latest)	3m 25s
checks / test (3.12, lowest-direct, windows-latest)	3m 39s
checks / test (3.12, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.10, locked, windows-latest)	2m 44s
checks / test (3.13, locked, ubuntu-latest)	52s
checks / test (3.14, lowest-direct, windows-latest)	2m 23s
checks / test (3.13, lowest-direct, ubuntu-latest)	58s
checks / test (3.13, lowest-direct, windows-latest)	2m 42s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.14, locked, ubuntu-latest)	2m 31s
checks / test (3.14, locked, windows-latest)	3m 45s
checks / test (3.13, locked, windows-latest)	2m 40s
all-green	4s
	42m 28s

Provide feedback