Add Taiwan country code to be formatted for local calls to remove the
international prefix.

This change will also include a small refactor to store the country
codes in an array so other countries can be more easily added/removed.

Flag: com.android.internal.telephony.flags.national_country_code_formatting_for_local_calls

Bug: 293993310
Test: manual validity test, atest PhoneNumberUtilsTest
Change-Id: I0dfd133904103ff645a2d2ecb08c69a2cc9ede28
diff --git a/flags/calling.aconfig b/flags/calling.aconfig
index c1dc7e7..2809f79 100644
--- a/flags/calling.aconfig
+++ b/flags/calling.aconfig
@@ -21,6 +21,17 @@
 
 # OWNER=stevestatia TARGET=24Q4
 flag {
+    name: "national_country_code_formatting_for_local_calls"
+    namespace: "telephony"
+    description: "Make requests and bug fixes for formatting local calls based on country codes easier with a more scalable solution."
+    bug: "293993310"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}
+
+# OWNER=stevestatia TARGET=24Q4
+flag {
     name: "remove_country_code_from_local_singapore_calls"
     namespace: "telephony"
     description: "Fix bug where the country code is being shown when merging in local Singapore numbers to conference calls."