[FIR2IR] Split composeSignature method into three for different types of declarations

This is needed to avoid passing `containingClass` for non-callable
  declarations

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrPluginContext.kt

@@ -87,7 +87,7 @@ class Fir2IrPluginContext(
 
     private inline fun <R> referenceClassLikeSymbol(
         id: ClassId,
-        firSymbolExtractor: (ClassId) -> FirBasedSymbol<*>?,
+        firSymbolExtractor: (ClassId) -> FirClassLikeSymbol<*>?,
         irSymbolExtractor: (IdSignature) -> R
     ): R? {
         val firSymbol = firSymbolExtractor(id) ?: return null

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/signaturer/FirBasedSignatureComposer.kt

@@ -84,10 +84,26 @@ class FirBasedSignatureComposer(val mangler: FirMangler) {
         }
     }
 
+    fun composeSignature(declaration: FirClassLikeDeclaration): IdSignature? {
+        return composeSignatureImpl(declaration, containingClass = null, forceExpect = false)
+    }
+
     fun composeSignature(
-        declaration: FirDeclaration,
+        declaration: FirCallableDeclaration,
         containingClass: ConeClassLikeLookupTag? = null,
-        forceExpect: Boolean = false,
+        forceExpect: Boolean = false
+    ): IdSignature? {
+        return composeSignatureImpl(declaration, containingClass, forceExpect)
+    }
+
+    fun composeSignature(declaration: FirScript): IdSignature? {
+        return composeSignatureImpl(declaration, containingClass = null, forceExpect = false)
+    }
+
+    private fun composeSignatureImpl(
+        declaration: FirDeclaration,
+        containingClass: ConeClassLikeLookupTag?,
+        forceExpect: Boolean
     ): IdSignature? {
         if (declaration is FirAnonymousObject || declaration is FirAnonymousFunction) return null
         if (declaration is FirRegularClass && declaration.classId.isLocal) return null