feat: Move over the contacts API

pigeon/contacts.dart

@@ -0,0 +1,29 @@
+import 'package:pigeon/pigeon.dart';
+
+@ConfigurePigeon(
+  PigeonOptions(
+    dartOut: 'lib/pigeon/contacts.g.dart',
+    kotlinOut:
+        'android/src/main/kotlin/org/moxxy/moxxy_native/contacts/ContactsApi.kt',
+    kotlinOptions: KotlinOptions(
+      package: 'org.moxxy.moxxy_native.contacts',
+    ),
+  ),
+)
+
+/// The type of icon to use when no avatar path is provided.
+enum FallbackIconType {
+  none,
+  person,
+  notes;
+}
+
+@HostApi()
+abstract class MoxxyContactsApi {
+  void recordSentMessage(
+    String name,
+    String jid,
+    String? avatarPath,
+    FallbackIconType fallbackIcon,
+  );
+}