feat: AI Assisted Code Suggestion extension

What does this MR do and why?

feat: AI Assisted Code Suggestion extension

• default disabled

Related #108 (closed)

Next steps:

1. Refactor Makefile Code suggestions: deduplicate code in Makefile (#139 - closed)

2. Move to a feature flag to be disabled by default Authentication : Code suggestions Web IDE: feat... (gitlab#404428 - closed)

3. Check CORS issues Support cross-origin request (CORS) for API (gitlab-org/modelops/applied-ml/code-suggestions/ai-assist#52 - closed)

4. A few dozen UX design issues

5. Auth issues

• Web IDE token creation and send Code suggestions: Get a token and send it to mo... (#141 - closed)
• (This) Client side (frontend) authentication Authentication: Authenticate Code Suggestions ... (#140 - closed)
• v3 backend for the model gateway Authentication: Authorize using stateless JWT... (gitlab-org/modelops/applied-ml/code-suggestions/ai-assist#56 - closed)
• GitLab API endpoint to create an auth token for code suggestions Authentication: Create endpoint to issue access... (gitlab#404427 - closed)

Screenshots or screen recordings

How to set up and validate locally

!!!! Use Incognito mode in Chrome each time !!!

1. Use a local code suggestions proxy https://gitlab.com/a_akgun/code-suggestions-proxy, using your own gitlab.com personal access token for a gitlab-org member:
2. Here's the configuration

@@ -1,4 +1,3 @@
 export const CONFIG_NAMESPACE = 'gitlab';
 export const AI_ASSISTED_CODE_SUGGESTIONS_CONFIG_NAMESPACE = 'gitlab.aiAssistedCodeSuggestions';
-export const AI_ASSISTED_CODE_SUGGESTIONS_API_URL =
-  'https://codesuggestions.gitlab.com/v1/completions';
+export const AI_ASSISTED_CODE_SUGGESTIONS_API_URL = 'http://127.0.0.1:8037/v1/completions';

3. Run npm run start for the code suggestions
4. Run yarn start:example for the web ide.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.