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/javaBean/DifferentGetterAndSetter.fir.txt

@@ -0,0 +1,6 @@
+public open class DifferentGetterAndSetter : R|java/lang/Object| {
+    public open operator function setSomething(color: R|ft<java/lang/String, java/lang/String?>|!): R|kotlin/Unit|
+
+    public open operator function getSomething(): R|kotlin/Int|
+
+}

compiler/testData/loadJava/compiledJava/javaBean/JavaBeanAbstractGetter.fir.txt

@@ -0,0 +1,6 @@
+public abstract interface JavaBeanAbstractGetter : R|java/lang/Object| {
+    public abstract operator function getRed(): R|kotlin/Int|
+
+    public abstract operator function getBlue(): R|kotlin/Int|
+
+}

compiler/testData/loadJava/compiledJava/javaBean/JavaBeanVal.fir.txt

@@ -0,0 +1,4 @@
+public open class JavaBeanVal : R|java/lang/Object| {
+    public open operator function getColor(): R|ft<java/lang/String, java/lang/String?>|!
+
+}

compiler/testData/loadJava/compiledJava/javaBean/JavaBeanVar.fir.txt

@@ -0,0 +1,6 @@
+public open class JavaBeanVar : R|java/lang/Object| {
+    public open operator function getColor(): R|ft<java/lang/String, java/lang/String?>|!
+
+    public open operator function setColor(string: R|ft<java/lang/String, java/lang/String?>|!): R|kotlin/Unit|
+
+}

compiler/testData/loadJava/compiledJava/javaBean/JavaBeanVarOfGenericType.fir.txt

@@ -0,0 +1,6 @@
+<P> public open class JavaBeanVarOfGenericType : R|java/lang/Object| {
+    public open operator function getCharacters(): R|ft<java/util/ArrayList<ft<P, P?>>, java/util/ArrayList<ft<P, P?>>>|
+
+    public open operator function setCharacters(characters: R|ft<java/util/ArrayList<ft<P, P?>>, java/util/ArrayList<ft<P, P?>>>|): R|kotlin/Unit|
+
+}

compiler/testData/loadJava/compiledJava/javaBean/TwoSetters.fir.txt

@@ -0,0 +1,6 @@
+public open class TwoSetters : R|java/lang/Object| {
+    public open operator function setSize(size: R|ft<java/lang/String, java/lang/String?>|!): R|kotlin/Unit|
+
+    public open operator function setSize(size: R|kotlin/Int|): R|kotlin/Unit|
+
+}