Add custom search param for Patient name and identifier (#3563)

android/engine/src/main/java/org/smartregister/fhircore/engine/configuration/app/ConfigService.kt

@@ -109,10 +109,22 @@ interface ConfigService {
         description = "Search the sort field"
       }
 
+    val patientSearchParameter =
+      SearchParameter().apply {
+        url = "http://smartregister.org/SearchParameter/patient-search"
+        addBase("Patient")
+        name = SEARCH_PARAM
+        code = SEARCH_PARAM
+        type = Enumerations.SearchParamType.STRING
+        expression = "Patient.name.text | Patient.identifier.value"
+        description = "Search patients by name and identifier fields"
+      }
+
     return listOf(
       activeGroupSearchParameter,
       flagStatusSearchParameter,
       medicationSortSearchParameter,
+      patientSearchParameter,
     )
   }
 
@@ -121,6 +133,7 @@ interface ConfigService {
     const val APP_VERSION = "AppVersion"
     const val STATUS_SEARCH_PARAM = "status"
     const val SORT_SEARCH_PARAM = "sort"
+    const val SEARCH_PARAM = "search"
     const val MEDICATION_SORT_URL = "http://smartregister.org/SearchParameter/medication-sort"
   }
 }