Add support for manual checkpoints #2149

Job	Run time
typecheck / typecheck	2m 19s
units / 🧪 Unit Tests	2m 12s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	1m 50s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	1m 50s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	2m 0s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	1m 59s
	12m 10s

Provide feedback