Passing unrecognized arguments to fairchem cli does not raise a useful error

[lbluque]

If I pass an unrecognized argument (or accidentally misspell one, or have one that is no longer supported) I get the following error:

Traceback (most recent call last):
  File "/private/home/lbluque/.micromamba/envs/fairchem/bin/fairchem", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/private/home/lbluque/develop/fairchem/src/fairchem/core/_cli.py", line 70, in main
    config = build_config(args, override_args)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/home/lbluque/develop/fairchem/src/fairchem/core/common/utils.py", line 514, in build_config
    overrides = create_dict_from_args(args_override)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/private/home/lbluque/develop/fairchem/src/fairchem/core/common/utils.py", line 398, in create_dict_from_args
    keys_concat, val = arg.removeprefix("--").split("=")
    ^^^^^^^^^^^^^^^^

We should raise an informative error instead.