feat: implement MSSQL extractor, transformer, and Postgres loader for enhanced data migration

cmd/go_migrate/main.go

@@ -7,6 +7,9 @@ import (
 	"time"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/extractors"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/loaders"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/transformers"
 	"github.com/jackc/pgx/v5/pgxpool"
 	log "github.com/sirupsen/logrus"
 )
@@ -87,11 +90,24 @@ func processMigrationJobs(
 	chJobs := make(chan config.Job, len(jobs))
 	var wgJobs sync.WaitGroup
 
+	extractor := extractors.NewMssqlExtractor(sourceDb)
+	transformer := transformers.NewMssqlTransformer()
+	loader := loaders.NewPostgresLoader(targetDb)
+
 	for i := range maxParallelWorkers {
 		wgJobs.Go(func() {
 			for job := range chJobs {
 				log.Infof("[worker %d] >>> Processing job: %s.%s <<<", i, job.SourceTable.Schema, job.SourceTable.Table)
-				res := processMigrationJob(ctx, sourceDb, targetDb, job)
+				res := processMigrationJob(
+					ctx,
+					sourceDb,
+					targetDb,
+					extractor,
+					transformer,
+					loader,
+					job,
+				)
+
 				chJobResults <- res
 			}
 		})