Introduce session #544

Job	Run time
Check formatting	16s
Run unit tests (windows-latest)	3m 32s
Compile on MSRV	57s
Check clippy	1m 5s
Run unit tests (ubuntu-latest)	1m 39s
Validate MSRV and minimal dependency versions (Cargo.lock.min, minimal dependency versions)	16s
Run integration tests (5)	2m 46s
Validate MSRV and minimal dependency versions (Cargo.lock.msrv, MSRV)	19s
Run unit tests (macOS-latest)	1m 30s
Run integration tests (4.4)	2m 36s
Release	0s
	14m 56s

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