Refactor implementation for loading data on repositories to improve performance

android/engine/src/main/java/org/smartregister/fhircore/engine/configuration/migration/MigrationConfig.kt

@@ -25,7 +25,7 @@
 data class MigrationConfig(
   val updateValues: List<UpdateValueConfig>,
   val resourceConfig: FhirResourceConfig,
-  val rules: List<RuleConfig>,
+  val rules: List<RuleConfig> = emptyList(),
   val version: Int,
   val purgeAffectedResources: Boolean = false,
   val createLocalChangeEntitiesAfterPurge: Boolean = true,

android/engine/src/main/java/org/smartregister/fhircore/engine/configuration/register/RegisterConfiguration.kt

@@ -39,7 +39,7 @@ data class RegisterConfiguration(
   val registerCard: RegisterCardConfig = RegisterCardConfig(),
   val fabActions: List<NavigationMenuConfig> = emptyList(),
   val noResults: NoResultsConfig? = null,
-  val pageSize: Int = 10,
+  val pageSize: Int = 20,
   val activeResourceFilters: List<ActiveResourceFilterConfig> =
     listOf(
       ActiveResourceFilterConfig(resourceType = ResourceType.Patient, active = true),

android/engine/src/main/java/org/smartregister/fhircore/engine/configuration/register/RegisterContentConfig.kt

@@ -24,7 +24,7 @@ data class RegisterContentConfig(
   val separator: String? = null,
   val display: String? = null,
   val placeholderColor: String? = null,
-  val rules: List<RuleConfig>? = null,
+  val rules: List<RuleConfig> = emptyList(),
   val visible: Boolean? = null,
   val computedRules: List<String>? = null,
   val searchByQrCode: Boolean? = null,