Implement FIR loading for Java (classes, supertypes, parameters, funs)

Properties aren't implemented yet
FIR symbol provider functions return more specialized types now
Related to KT-28918, KT-29636, KT-29218

#KT-28788 Fixed

idea/testData/fir/multiModule/overrideWithJava/jvm/B.txt

@@ -0,0 +1,18 @@
+FILE: B.kt
+    public final class B : R|A| {
+        public constructor(): super<R|A|>()
+
+        public final override function foo(): R|B| {
+            return@@@foo this#
+        }
+
+        public final function bar(): R|B| {
+            return@@@bar this#
+        }
+
+        public final function test(): R|kotlin/Unit| {
+            R|/B.foo|()
+            <Ambiguity: bar, [/B.bar, /A.bar]>#()
+        }
+
+    }