Add AnalysisHandlerExtension extension point for K2JsCompiler

AnalysisHandlerExtension allows compiler plugins to:
1. Intercept and override the default analysis.
2. Utilize the compiler infrastructure to do custom analysis.

A well know plugin on the JVM platform is KAPT.

compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsTestWithJsStdLib.kt

@@ -60,7 +60,7 @@ abstract class AbstractDiagnosticsTestWithJsStdLib : AbstractDiagnosticsTest() {
         moduleTrace.record<ModuleDescriptor, ModuleKind>(MODULE_KIND, moduleContext.module, getModuleKind(files))
         config.configuration.languageVersionSettings = languageVersionSettings
         return TopDownAnalyzerFacadeForJS.analyzeFilesWithGivenTrace(
-            files, moduleTrace, moduleContext, config.configuration, CompilerEnvironment,
+            files, moduleTrace, moduleContext, config.configuration, CompilerEnvironment, config.project
         )
     }