feat: add exponential backoff retry strategy

Introduce a retry policy with exponential backoff and jitter for extractor and loader errors, with configurable max attempts and delay caps.

cmd/go_migrate/main.go

@@ -9,6 +9,7 @@ import (
 	"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/table_analyzers"
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl/transformers"
 	"github.com/jackc/pgx/v5/pgxpool"
 	log "github.com/sirupsen/logrus"
@@ -90,6 +91,8 @@ func processMigrationJobs(
 	chJobs := make(chan config.Job, len(jobs))
 	var wgJobs sync.WaitGroup
 
+	sourceTableAnalyzer := table_analyzers.NewMssqlTableAnalyzer(sourceDb)
+	targetTableAnalyzer := table_analyzers.NewPostgresTableAnalyzer(targetDb)
 	extractor := extractors.NewMssqlExtractor(sourceDb)
 	transformer := transformers.NewMssqlTransformer()
 	loader := loaders.NewPostgresLoader(targetDb)
@@ -100,8 +103,8 @@ func processMigrationJobs(
 				log.Infof("[worker %d] >>> Processing job: %s.%s <<<", i, job.SourceTable.Schema, job.SourceTable.Table)
 				res := processMigrationJob(
 					ctx,
-					sourceDb,
-					targetDb,
+					sourceTableAnalyzer,
+					targetTableAnalyzer,
 					extractor,
 					transformer,
 					loader,