Is there a way to only show base "--help" for explicitly defined options?

When creating the aliases, flags, etc for the options, is there a way to only show those options that I've explicitly defined?

For example, consider this code:
```python
from traitlets import Unicode
from traitlets.config import SingletonConfigurable
from traitlets.config.application import Application

class ConfigStore(SingletonConfigurable):
github_token = Unicode("", help="Your Github access token").tag(config=True)

class AppController(Application):
classes = [ConfigStore]
aliases = {
("github-token"): (
"ConfigStore.github_token",
"your github access token, usually set via environment variable GITHUB_TOKEN",
),
}

def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)

if __name__ == "__main__":
app = AppController()
app.launch_instance()
```

When called with `--help` it outputs the following:
```
This is an application.

Options
=======
The options below are convenience aliases to configurable class-options,
as listed in the "Equivalent to" description-line of the aliases.
To see all configurable class-options for some , use:
--help-all

--debug
Set log-level to debug, for the most verbose logging.
Equivalent to: [--Application.log_level=10]
--show-config
Show the application's configuration (human-readable format)
Equivalent to: [--Application.show_config=True]
--show-config-json
Show the application's configuration (json format)
Equivalent to: [--Application.show_config_json=True]
--github-token=
your github access token, usually set via environment variable GITHUB_TOKEN
Default: ''
Equivalent to: [--ConfigStore.github_token]

To see all available configurables, use `--help-all`.
```

Is there a way to configure the Application such that it only displays this:

```
--github-token=
your github access token, usually set via environment variable GITHUB_TOKEN
Default: ''
```

Sorry to ask a question in a github issue. Is there a better forum to ask these sorts of questions? Thank you!!

Start with traitlets.config.application.Application and trace how the --help output is assembled from aliases and built-in options. Confirm the desired behavior against the example: --help should show only explicitly defined options such as --github-token, while --help-all remains available for the full set.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.