ModelingToolkitBase-v1.48.0

ModelingToolkitBase ModelingToolkitBase-v1.48.0

Diff since ModelingToolkitBase-v1.45.1

Merged pull requests:

• refactor: ensure init system is in terms of unknowns of DAE (#4631) (@AayushSabharwal)
• feat: add reversible transformation API (#4655) (@AayushSabharwal)
• refactor: update MTK to reversible transformations API (#4659) (@AayushSabharwal)
• build: restore accidentally removed sources entries (#4664) (@AayushSabharwal)
• build: bump MTKBase minor version (#4665) (@AayushSabharwal)
• build: bump MTK patch version (#4667) (@AayushSabharwal)
• Declare public API (unlock downstream ExplicitImports allow-lists) (#4669) (@ChrisRackauckas-Claude)
• As/bump version (#4673) (@AayushSabharwal)