Support Java constructors in FIR (related to KT-29218)

compiler/testData/loadJava/compiledJava/constructor/ConstructorGenericDeep.fir.txt

@@ -1,2 +1,4 @@
 public open class ConstructorGenericDeep : R|java/lang/Object| {
+    public final function ConstructorGenericDeep(cl: R|ft<java/lang/Class<ft<P, P?>>, java/lang/Class<ft<P, P?>>?>|!): R|test/ConstructorGenericDeep|
+
 }

compiler/testData/loadJava/compiledJava/constructor/ConstructorGenericSimple.fir.txt

@@ -1,2 +1,4 @@
 public open class ConstructorGenericSimple : R|java/lang/Object| {
+    public final function ConstructorGenericSimple(p: R|ft<P, P?>|!): R|test/ConstructorGenericSimple|
+
 }

compiler/testData/loadJava/compiledJava/constructor/ConstructorGenericUpperBound.fir.txt

@@ -1,2 +1,4 @@
 public open class ConstructorGenericUpperBound : R|java/lang/Object| {
+    public final function ConstructorGenericUpperBound(p: R|ft<P, P?>|!): R|test/ConstructorGenericUpperBound|
+
 }