Add FIR enhancement tests, fix some exceptions / problems around them

Test data and tests themselves are based on
compiler/testData/loadJava/compiledJava

compiler/testData/loadJava/compiledJava/static/DeeplyInnerClass.fir.txt

@@ -0,0 +1,2 @@
+public open class DeeplyInnerClass : R|java/lang/Object| {
+}

compiler/testData/loadJava/compiledJava/static/DeeplyNestedStatic.fir.txt

@@ -0,0 +1,2 @@
+public open class DeeplyNestedStatic : R|java/lang/Object| {
+}

compiler/testData/loadJava/compiledJava/static/Enum.fir.txt

@@ -0,0 +1,2 @@
+public final enum class Enum : R|java/lang/Enum<test/Enum>| {
+}

compiler/testData/loadJava/compiledJava/static/InnerClass.fir.txt

@@ -0,0 +1,2 @@
+public open class InnerClass : R|java/lang/Object| {
+}

compiler/testData/loadJava/compiledJava/static/Simple.fir.txt

@@ -0,0 +1,4 @@
+public open class Simple : R|java/lang/Object| {
+    public open operator function foo(): R|kotlin/Unit|
+
+}

compiler/testData/loadJava/compiledJava/static/StaticFinal.fir.txt

@@ -0,0 +1,2 @@
+public open class StaticFinal : R|java/lang/Object| {
+}

compiler/testData/loadJava/compiledJava/static/StaticMembersFromParentClass.java

@@ -1,3 +1,4 @@
+// SKIP_IN_FIR_TEST
 package test;
 
 class Parent {

compiler/testData/loadJava/compiledJava/static/StaticMembersFromParentClassVisibility.java

@@ -1,3 +1,4 @@
+// SKIP_IN_FIR_TEST
 package test;
 
 class Parent {

compiler/testData/loadJava/compiledJava/static/StaticMembersFromParentInterface.java

@@ -1,3 +1,4 @@
+// SKIP_IN_FIR_TEST
 package test;
 
 interface Parent1 {

compiler/testData/loadJava/compiledJava/static/StaticMembersInEnum.fir.txt

@@ -0,0 +1,2 @@
+public final enum class StaticMembersInEnum : R|java/lang/Enum<test/StaticMembersInEnum>| {
+}

compiler/testData/loadJava/compiledJava/static/StaticMembersInEnumFromParents.java

@@ -1,3 +1,4 @@
+// SKIP_IN_FIR_TEST
 package test;
 
 interface Parent1 {