feat(mavlink): adopt the kaptan-native dialect

firmware/libs/kaptan-mavlink/definitions/transfer/file_data.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<mavlink>
+  <version>3</version>
+  <dialect>0</dialect>
+  <messages>
+    <message id="51026" name="FILE_DATA">
+      <description>One directed file chunk. Its logical length is min(246, file_size - position) from the open transfer.</description>
+      <field type="uint32_t" name="position"/>
+      <field type="uint16_t" name="transfer_id"/>
+      <field type="uint8_t" name="target_system"/>
+      <field type="uint8_t" name="target_component"/>
+      <field type="uint8_t" name="status" enum="FILE_STATUS">Upload requests use UNSPECIFIED; read responses use OK.</field>
+      <field type="uint8_t[246]" name="data"/>
+    </message>
+  </messages>
+</mavlink>