[FIR] Create CFG for files to track top-level property initialization

In order to properly analyze top-level property initialization, a
control-flow graph must be created for FirFiles. This change adds the
foundation for the file CFG and updates body resolve to create the CFG.
Checking the CFG for proper initialization is separated into a following
change to ease code review.

KT-56683

compiler/testData/diagnostics/testsWithStdLib/annotations/annotationParameterMustBeConstant/simple.kt

@@ -1,4 +1,5 @@
 // IGNORE_REVERSED_RESOLVE
+// IGNORE_CONTRACT_VIOLATIONS
 // FIR_IDENTICAL
 @Retention(AnnotationRetention.SOURCE)
 @Repeatable