FIR: enhance Java type parameter bounds

This also fixes handling of self-recursive types.

TODO: fix jspecify/{strict,warn}Mode/Captured.fir.kt

compiler/testData/diagnostics/foreignAnnotationsTests/tests/kt47920.fir.kt

@@ -0,0 +1,11 @@
+// MUTE_FOR_PSI_CLASS_FILES_READING
+
+// FILE: J1.java
+import io.reactivex.rxjava3.annotations.*;
+
+public class J1<@NonNull T> {}
+
+// FILE: main.kt
+fun main() {
+    J1<<!UPPER_BOUND_VIOLATED!>Any?<!>>() // violated nullability, no warnings; but there is an error with -Xtype-enhancement-improvements-strict-mode
+}

compiler/testData/diagnostics/foreignAnnotationsTests/tests/kt47920.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // MUTE_FOR_PSI_CLASS_FILES_READING
 
 // FILE: J1.java