[FIR] KT-52157: Fix missing type parameter annotations

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/AbstractAnnotationDeserializer.kt

@@ -172,6 +172,9 @@ abstract class AbstractAnnotationDeserializer(
 
     abstract fun loadTypeAnnotations(typeProto: ProtoBuf.Type, nameResolver: NameResolver): List<FirAnnotation>
 
+    open fun loadTypeParameterAnnotations(typeParameterProto: ProtoBuf.TypeParameter, nameResolver: NameResolver) =
+        emptyList<FirAnnotation>()
+
     fun deserializeAnnotation(
         proto: ProtoBuf.Annotation,
         nameResolver: NameResolver,

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/FirTypeDeserializer.kt

@@ -76,6 +76,7 @@ class FirTypeDeserializer(
                     this.containingDeclarationSymbol = containingSymbol ?: error("Top-level type parameter ???")
                     variance = proto.variance.convertVariance()
                     isReified = proto.reified
+                    annotations += annotationDeserializer.loadTypeParameterAnnotations(proto, nameResolver)
                 }
                 result[proto.id] = symbol
             }