Tests

refactor: move `Tool` to a separate package; refactor serde #15562

Job	Run time
format	18s
check-imports	15s
Unit / ubuntu-latest	3m 38s
Unit / windows-latest	5m 55s
Unit / macos-latest	2m 14s
Integration / macos-latest	6m 20s
Integration / ubuntu-latest	7m 29s
lint	1m 48s
Integration / windows-latest	8m 14s
Tests completed / Mark tests as completed	1s
	36m 12s

Provide feedback