[internal] Add a way to append values to optional arguments in parse_arguments decorator (#1122)

Add support for the `append` action for ArgumentParser in the `parse_arguments` decorator on optional arguments.

This makes us able to support this:

```
command --arg 1 --arg 2 --arg 3
```

And get `[1, 2, 3]` as the `arg` value.

This CL is required to make changes to
#1120 before merging.

---------

Co-authored-by: crazy hugsy <hugsy@users.noreply.github.com>

Author: ValekoZ

gef.py

@@ -491,6 +491,10 @@ def wrapper(*args: Any, **kwargs: Any) -> Callable:
                 elif argtype is bool:
                     parser.add_argument(*argname, action="store_false" if argvalue else "store_true")
                     continue
+                elif argtype in (list, tuple):
+                    parser.add_argument(*argname, type=type(argvalue[0]),
+                                        default=[], action="append")
+                    continue
                 parser.add_argument(*argname, type=argtype, default=argvalue)
 
             parsed_args = parser.parse_args(*(args[1:]))