[FIR] Support IntegerLiteralTypes

idea/testData/fir/lazyResolve/import/bar/bar.txt

@@ -1,4 +1,4 @@
 FILE: bar.kt
     public final fun barbar(): R|kotlin/Int| {
-        ^barbar Int(13)
+        ^barbar IntegerLiteral(13)
     }

idea/testData/fir/lazyResolve/inLocal/main.txt

@@ -7,6 +7,6 @@ FILE: main.kt
         R|<local>/foo|()
     }
     public final fun bar(): R|kotlin/Int| {
-        lval x: <implicit> = Int(4)
-        ^bar Int(9).times#(x#)
+        lval x: <implicit> = IntegerLiteral(4)
+        ^bar IntegerLiteral(9).times#(x#)
     }

idea/testData/fir/lazyResolve/simple/callMe.txt

@@ -3,5 +3,5 @@ FILE: callMe.kt
         ^callMe Int(42)
     }
     public final fun other(): R|kotlin/Unit| {
-        lval x: <implicit> = Int(1)
+        lval x: <implicit> = IntegerLiteral(1)
     }