Refactor debug library to use object:🧝:* (#1860)

* Add GDB test

* rm stray test resource

* use object:🧝:* structures

* install gdb on CI

tests/all/debug/mod.rs

@@ -1,4 +1,5 @@
 mod dump;
+mod gdb;
 mod lldb;
 mod obj;
 mod simulate;