2/2 analysis-api: Initial implementation for contracts

Review: https://jetbrains.team/p/kt/reviews/7652

Put this change into a separate commit because:
1. The change is boring and clutters the diff of the first commit
2. The first commits is already too big

analysis/analysis-api/testData/scopes/memberScopeByFqName/enumEntry.txt

@@ -56,6 +56,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: kotlin/Enum.clone
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: false
@@ -83,6 +84,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: test/E.compareTo
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: false
@@ -130,6 +132,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: kotlin/Enum.equals
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: false
@@ -177,6 +180,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: kotlin/Enum.hashCode
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: false
@@ -204,6 +208,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: kotlin/Enum.toString
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: false