WIP: Add Composer to packages
What does this MR do?
Upload Composer packages to packages page and add API endpoints
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
- Changelog entry added, if necessary
- Documentation created/updated
- Tests added for this feature/bug
- Tested in all supported browsers
- Conforms to the code review guidelines
- Conforms to the merge request performance guidelines
- Conforms to the style guides
EE specific content should be in the top level
- Security reports checked/validated by reviewer