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/protectedPackage/ProtectedPackageConstructor.fir.txt

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

compiler/testData/loadJava/compiledJava/protectedPackage/ProtectedPackageFun.fir.txt

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

compiler/testData/loadJava/compiledJava/protectedPackage/ProtectedPackageProperty.fir.txt

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