Merged PRs

dolt

• 2428: /go/cmd/dolt/commands: Updated cli docs for dolt migrate
• 2423: More intelligent drop / create for tables
  This addresses #2390 and other issues.
  Previously we were only reusing dropped tables if they had exactly the same schema upon recreation. This PR loosens that constraint.
• 2402: Refactor the cli's SQL Engine to its own package

Closed Issues

• 2329: Should not be able to add primary key when cells have null value