Add `Migrator::with_migrations()` constructor #1579

Job	Run time
Functional Test (MySQL)	44s
Integration Test (macOS-13)	1m 37s
Integration Test (macOS-latest)	36s
Integration Test (ubuntu-latest)	34s
Check	46s
Functional Test (PostgreSQL)	41s
Build (windows-latest)	1m 38s
Build (ubuntu-latest)	47s
Build (macOS-13)	1m 19s
Build (macOS-latest)	42s
Functional Test (SQLite)	30s
	9m 54s

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