[FIR] Reorganize modules of raw fir builders

compiler/fir/raw-fir/psi2fir/testData/rawBuilder/declarations/genericFunctions.txt

@@ -0,0 +1,14 @@
+FILE: genericFunctions.kt
+    public? final? interface Any : R|kotlin/Any| {
+    }
+    public? final? inline fun <reified T : Any> Any.safeAs(): T? {
+        ^safeAs (this# as? T)
+    }
+    public? abstract class Summator : R|kotlin/Any| {
+        public? constructor(): R|Summator| {
+            super<R|kotlin/Any|>()
+        }
+
+        public? abstract fun <T> plus(first: T, second: T): T
+
+    }