fix: refactor CommitAggregation to move lines counters to PullRequestAggregation

Author: Adrià Manero

src/main/java/io/pakland/mdas/githubstats/domain/entity/CommitAggregation.java

@@ -6,9 +6,6 @@ public class CommitAggregation implements CSVExportable {
 
     private int numCommits;
 
-    private int linesAdded;
-
-    private int linesRemoved;
 
     public static CommitAggregation aggregate(List<Commit> commits) {
         CommitAggregation commitAggregation = new CommitAggregation();
@@ -20,21 +17,13 @@ public int getNumCommits() {
         return numCommits;
     }
 
-    public int getLinesAdded() {
-        return linesAdded;
-    }
-
-    public int getLinesRemoved() {
-        return linesRemoved;
-    }
-
     @Override
     public String toCSV() {
         String sep = ",";
         String lineSep = "\n";
 
-        List<String> metrics = List.of("numCommits", "linesAdded", "linesRemoved");
-        List<Object> data = List.of(numCommits, linesAdded, linesRemoved);
+        List<String> metrics = List.of("numCommits");
+        List<Object> data = List.of(numCommits);
 
         String header = String.join(sep, metrics);
         String body = String.join(sep, data.stream().map(Object::toString).toList());

src/main/java/io/pakland/mdas/githubstats/domain/entity/PullRequestAggregation.java

@@ -3,6 +3,17 @@
 import java.util.List;
 
 public class PullRequestAggregation implements CSVExportable {
+    private int linesAdded;
+
+    private int linesRemoved;
+
+    public int getLinesAdded() {
+        return linesAdded;
+    }
+
+    public int getLinesRemoved() {
+        return linesRemoved;
+    }
 
     public PullRequestAggregation aggregate(List<PullRequest> pullRequests) {
         // TODO