Add compressed payload variant

mesh.options

@@ -12,6 +12,8 @@
 # note: this payload length is ONLY the bytes that are sent inside of the Data protobuf (excluding protobuf overhead). The 16 byte header is
 # outside of this envelope
 *Data.payload max_size:237
+*Data.payload_compressed max_size:237
+*Data.payloadVariant anonymous_oneof:true
 
 # Big enough for 1.2.28.568032c-d
 *MyNodeInfo.firmware_version max_size:18

mesh.proto

@@ -628,10 +628,18 @@ message Data {
    */
   PortNum portnum = 1;
 
-  /*
-   * TODO: REPLACE
-   */
-  bytes payload = 2;
+  oneof payloadVariant {
+
+    /*
+    * TODO: REPLACE
+    */
+    bytes payload = 2;
+
+    /*
+    * TODO: REPLACE
+    */
+    bytes payload_compressed = 10;
+  }
 
   /*
    * Not normally used, but for testing a sender can request that recipient