Code suggestions: status bar icon shows a loading state
## Background
We will be launching AI assisted code suggestions as a pre-installed extension in the GitLab web IDE in May. This issue is part of an [epic](https://gitlab.com/groups/gitlab-org/-/epics/10110) for the UX portion of this project.
## Background for this issue
We have an icon in the status bar that shows the various states of code suggestions (https://gitlab.com/gitlab-org/gitlab-web-ide/-/issues/132).
The icons we use in the status bar appear here:

The icons of the different status are as follows:
| Image | Description |
| ------ | ------ |
|  | Enabled |
|  | Disabled |
|  | Error (e.g. code suggestions down) |
## Problem to solve
We have received feedback that it can be difficult to tell if there is a code suggestion loading as one is typing. Even though code suggestion is enabled, it is not clear if it is currently retrieving a suggestion.
## Suggested solution
* Add an additional icon to display the status when a code suggestion is loading.
* When the suggestion has loaded, the icon goes back to the normal/enabled state
Icon to add:
| Image | Description |
| ------ | ------ |
|  | Icon to indicate that there is code suggestion loading |
Gif:

[Figma file](https://www.figma.com/file/n8e5S9eGCDKy9n15q68l4M/Code-Suggestions?node-id=185%3A290&t=yFEy3AaT9IuVAKz9-1)
issue