feat: add MSSQL table analyzer and integrate partition range generation for improved data migration

internal/app/etl/table_analyzers/main.go

@@ -0,0 +1,40 @@
+package table_analyzers
+
+import (
+	"context"
+
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/etl"
+	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/models"
+	"github.com/google/uuid"
+)
+
+func PartitionRangeGenerator(
+	ctx context.Context,
+	tableAnalyzer etl.TableAnalyzer,
+	tableInfo config.TableInfo,
+	partitionColumn string,
+	rowsPerPartition int64,
+) ([]models.Partition, error) {
+	rowsCount, err := tableAnalyzer.EstimateTotalRows(ctx, tableInfo)
+	if err != nil {
+		return nil, err
+	}
+
+	if rowsCount <= rowsPerPartition {
+		return []models.Partition{{
+			Id:             uuid.New(),
+			ShouldUseRange: false,
+			RetryCounter:   0,
+		}}, nil
+
+	}
+
+	partitionsCount := rowsCount / rowsPerPartition
+	partitions, err := tableAnalyzer.CalculatePartitionRanges(ctx, tableInfo, partitionColumn, partitionsCount)
+	if err != nil {
+		return nil, err
+	}
+
+	return partitions, nil
+}