Add `Migrator::with_migrations()` constructor #1581

Job	Run time
Check	40s
Integration Test (ubuntu-latest)	31s
Integration Test (macOS-latest)	54s
Integration Test (macOS-13)	1m 8s
Functional Test (SQLite)	35s
Build (ubuntu-latest)	37s
Functional Test (PostgreSQL)	44s
Build (macOS-latest)	47s
Functional Test (MySQL)	49s
Build (windows-latest)	1m 51s
Build (macOS-13)	52s
	9m 28s

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