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/delegatedMemberScope/simple.descriptors.txt

@@ -133,6 +133,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: /I.foo
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: false
@@ -160,6 +161,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: /I.smth
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: true

analysis/analysis-api/testData/scopes/delegatedMemberScope/simple.txt

@@ -42,6 +42,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: /I.foo
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: false
@@ -103,6 +104,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: /I.smth
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: true

analysis/analysis-api/testData/scopes/delegatedMemberScope/withOverridden.txt

@@ -2,6 +2,7 @@ KtFunctionSymbol:
   annotationsList: []
   callableIdIfNonLocal: /I2.bar
   contextReceivers: []
+  contractEffects: []
   hasStableParameterNames: true
   isBuiltinFunctionInvoke: false
   isExtension: false