refactor: change UserError to extend RuntimeException for better error handling

Author: hoc081098

domain/src/main/java/com/hoc/flowmvi/domain/model/UserError.kt

@@ -2,7 +2,7 @@ package com.hoc.flowmvi.domain.model
 
 import arrow.core.NonEmptySet
 
-sealed class UserError : Throwable() {
+sealed class UserError : RuntimeException() {
   data object NetworkError : UserError() {
     private fun readResolve(): Any = NetworkError
   }