feat: transparent session migration on server restart #2096

Job	Run time
checks / pre-commit	19s
checks / readme-snippets	13s
checks / test (3.11, locked, ubuntu-latest)	43s
checks / test (3.10, locked, ubuntu-latest)	37s
checks / test (3.11, lowest-direct, ubuntu-latest)	37s
checks / test (3.10, lowest-direct, ubuntu-latest)	39s
checks / test (3.10, lowest-direct, windows-latest)	2m 31s
checks / test (3.11, lowest-direct, windows-latest)	2m 59s
checks / test (3.11, locked, windows-latest)	2m 19s
checks / test (3.10, locked, windows-latest)	2m 7s
checks / test (3.12, locked, windows-latest)	3m 2s
checks / test (3.12, lowest-direct, ubuntu-latest)	43s
checks / test (3.12, lowest-direct, windows-latest)	3m 53s
checks / test (3.13, lowest-direct, windows-latest)	3m 8s
checks / test (3.13, locked, windows-latest)	2m 16s
checks / test (3.14, locked, ubuntu-latest)	2m 12s
checks / test (3.14, lowest-direct, windows-latest)	2m 31s
checks / test (3.13, lowest-direct, ubuntu-latest)	41s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.13, locked, ubuntu-latest)	38s
checks / test (3.14, locked, windows-latest)	2m 55s
checks / test (3.12, locked, ubuntu-latest)	43s
all-green	5s
	36m 57s

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