feat(mavlink): adopt the kaptan-native dialect

firmware/libs/kaptan-mavlink/definitions/publish/heartbeat.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0"?>
+<mavlink>
+  <version>3</version>
+  <dialect>0</dialect>
+  <enums>
+    <enum name="HEARTBEAT_STATE">
+      <entry value="1" name="HEARTBEAT_STATE_INITIALIZED_OUTPUTS_INHIBITED">
+        <description>Initialization completed and the physical output routes remain inhibited.</description>
+      </entry>
+    </enum>
+  </enums>
+  <messages>
+    <message id="51027" name="HEARTBEAT">
+      <description>Periodic liveness and discovery publication for the initialized output-inhibited firmware composition.</description>
+      <field type="uint8_t" name="state" enum="HEARTBEAT_STATE"/>
+    </message>
+  </messages>
+</mavlink>