feat(dolt): auto-commit write commands and set explicit commit authors (#1270)

Adds Dolt auto-commit functionality for write commands and sets explicit commit authors.

Includes fix for race condition in commandDidWrite (converted to atomic.Bool).

Original PR: #1267 by @coffeegoddd
Co-authored-by: Dustin Brown <dustin@dolthub.com>

cmd/bd/vc.go

@@ -131,6 +131,8 @@ Examples:
 			FatalErrorRespectJSON("commit requires Dolt backend (current backend does not support versioning)")
 		}
 
+		// We are explicitly creating a Dolt commit; avoid redundant auto-commit in PersistentPostRun.
+		commandDidExplicitDoltCommit = true
 		if err := vs.Commit(ctx, vcCommitMessage); err != nil {
 			FatalErrorRespectJSON("failed to commit: %v", err)
 		}