🔥 Improve plugins loaders

[damianpumar]

• [x] Remove duplicated names
• [x] Improve the way to load plugins and extensions
• [x] Auto loading new plugins
• [x] Convert to typescript
• [x] Delete unused directive

[github-actions[bot]]

The URL of the deployed environment for this PR is https://argilla-quickstart-pr-5697-ki24f765kq-no.a.run.app