[LL FIR] KT-57220 Optimize & combine synthetic function symbol providers

- Dependency symbol providers contained a lot of useless
  `FirExtensionSyntheticFunctionInterfaceProvider`s, because such a
  provider only generates function classes from compiler plugins. If
  there aren't any such `FunctionTypeKind`s in the session, there is no
  need to even add the provider.
- `FirExtensionSyntheticFunctionInterfaceProvider`s that are added to
  the list of dependency providers despite this optimization will now be
  combined in `LLFirCombinedSyntheticFunctionSymbolProvider`. It checks
  `ClassId` heuristics once, which is more efficient than checking them
  in every provider separately.

compiler/fir/providers/src/org/jetbrains/kotlin/fir/resolve/providers/impl/FirExtensionSyntheticFunctionInterfaceProvider.kt

@@ -69,11 +69,15 @@ abstract class FirSyntheticFunctionInterfaceProviderBase(
     val moduleData: FirModuleData,
     val kotlinScopeProvider: FirKotlinScopeProvider
 ) : FirSymbolProvider(session) {
+    @OptIn(FirSymbolProviderInternals::class)
     override fun getClassLikeSymbolByClassId(classId: ClassId): FirRegularClassSymbol? {
         if (!classId.mayBeSyntheticFunctionClassName()) return null
-        return cache.getValue(classId)
+        return getClassLikeSymbolByClassIdWithoutClassIdChecks(classId)
     }
 
+    @FirSymbolProviderInternals
+    fun getClassLikeSymbolByClassIdWithoutClassIdChecks(classId: ClassId): FirRegularClassSymbol? = cache.getValue(classId)
+
     @FirSymbolProviderInternals
     override fun getTopLevelCallableSymbolsTo(destination: MutableList<FirCallableSymbol<*>>, packageFqName: FqName, name: Name) {
     }
@@ -86,6 +90,9 @@ abstract class FirSyntheticFunctionInterfaceProviderBase(
     override fun getTopLevelPropertySymbolsTo(destination: MutableList<FirPropertySymbol>, packageFqName: FqName, name: Name) {
     }
 
+    @FirSymbolProviderInternals
+    fun getFunctionKindPackageNames(): Set<FqName> = session.functionTypeService.getFunctionKindPackageNames()
+
     override fun getPackage(fqName: FqName): FqName? {
         return fqName.takeIf { session.functionTypeService.hasKindWithSpecificPackage(it) }
     }