Fix explicit api issues in analysis modules

Explicit api mode was not working due to the bug.

^KT-57653

analysis/project-structure/src/org/jetbrains/kotlin/analysis/project/structure/KtCompilerPluginsProvider.kt

@@ -12,7 +12,7 @@ import org.jetbrains.kotlin.extensions.ProjectExtensionDescriptor
  */
 public abstract class KtCompilerPluginsProvider {
 
-    enum class CompilerPluginType {
+    public enum class CompilerPluginType {
         ASSIGNMENT
     }