feat: Add actual transformation functionality

Add actual transformation functionality to hale-transformer-api service.

SVC-1714

.gitignore

@@ -43,3 +43,4 @@ out/
 *.code-workspace
 # Local History for Visual Studio Code
 .history/
+

src/main/java/to/wetransform/hale/transformer/RunContext.java

@@ -0,0 +1,28 @@
+package to.wetransform.hale.transformer;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.io.FileUtils;
+
+public class RunContext {
+
+    private final List<Path> tempFiles = new ArrayList<>();
+
+    public File createTempDir() throws IOException {
+        Path path = Files.createTempDirectory("hale-transformer");
+        tempFiles.add(path);
+        return path.toFile();
+    }
+
+    public void cleanUp() throws IOException {
+        for (Path path : tempFiles) {
+            FileUtils.deleteDirectory(path.toFile());
+        }
+        tempFiles.clear();
+    }
+}