Add experimental support for cache-cleanup

- Includes basic implementation as `CacheCleaner`
- Integration test that checks unused files are removed:
  - Downloaded dependencies
  - Local build cache entries
  - Wrapper distributions

test/jest/resources/cache-cleanup/build.gradle

@@ -0,0 +1,11 @@
+plugins {
+    id 'java-library'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    api "org.apache.commons:commons-math3:${System.properties['commons-math3.version']}"
+}