[cls] write contracts information to cls stubs

^ KTIJ-24665
this information would be used to create resolved FirElements from stubs,
so no ProtoBuf would be kept in memory

compiler/fir/tree/build.gradle.kts

@@ -7,6 +7,7 @@ plugins {
 
 dependencies {
     api(project(":compiler:frontend.common"))
+    api(project(":core:compiler.common"))
     api(project(":compiler:fir:cones"))
 
     // Necessary only to store bound PsiElement inside FirElement