feat(mavlink): adopt the kaptan-native dialect

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

@@ -0,0 +1,14 @@
+<?xml version="1.0"?>
+<mavlink>
+  <version>3</version>
+  <dialect>0</dialect>
+  <messages>
+    <message id="51028" name="IMU">
+      <description>One accepted body-frame inertial observation in the native bounded sensor representation.</description>
+      <field type="uint64_t" name="time_us">Flight-controller monotonic acquisition time in microseconds.</field>
+      <field type="int16_t[3]" name="acceleration_milligravity">Body-frame acceleration in milligravity.</field>
+      <field type="int16_t[3]" name="angular_rate_milliradians_per_second">Body-frame angular rate in milliradians per second.</field>
+      <field type="int16_t" name="temperature_centidegrees_celsius">Sensor temperature in centidegrees Celsius.</field>
+    </message>
+  </messages>
+</mavlink>