Introduce TestingContext to pass data between tests and KotlinBuilder; introduce BuildLogger to log build events (build finished, files marked as dirty) in KotlinBuilder

jps-plugin/testData/incremental/changeIncrementalOption/experimentalOnJavaChanged/build.log

@@ -1,25 +1,37 @@
+================ Step #1 =================
+
 Cleaning output files:
-out/production/module1/META-INF/module1.kotlin_module
-out/production/module1/Module1_aKt.class
+  out/production/module1/META-INF/module1.kotlin_module
+  out/production/module1/Module1_aKt.class
 End of files
 Compiling files:
-module1/src/module1_a.kt
+  module1/src/module1_a.kt
+End of files
+Marked as dirty by Kotlin:
+  module1/src/module1_a.kt
+  module2/src/module2_c.kt
+  module3/src/module3_d.kt
+Exit code: OK
+------------------------------------------
+Cleaning output files:
+  out/production/module2/B.class
+  out/production/module2/META-INF/module2.kotlin_module
+  out/production/module2/Module2_cKt.class
+End of files
+Compiling files:
+  module2/src/module2_c.kt
+End of files
+Exit code: OK
+------------------------------------------
+Compiling files:
+  module2/src/module2_B.java
 End of files
 Cleaning output files:
-out/production/module2/B.class
-out/production/module2/META-INF/module2.kotlin_module
-out/production/module2/Module2_cKt.class
+  out/production/module3/META-INF/module3.kotlin_module
+  out/production/module3/Module3_dKt.class
 End of files
 Compiling files:
-module2/src/module2_c.kt
+  module3/src/module3_d.kt
 End of files
-Compiling files:
-module2/src/module2_B.java
-End of files
-Cleaning output files:
-out/production/module3/META-INF/module3.kotlin_module
-out/production/module3/Module3_dKt.class
-End of files
-Compiling files:
-module3/src/module3_d.kt
-End of files
+Exit code: OK
+------------------------------------------