Port the core package file feature from EE to CE

Problem to solve

If we want to support file upload for release API #17838 in a way that will leverage all the work we did for workhorse object storage acceleration and the effort in https://gitlab.com/gitlab-org/gitlab-ce/issues/59232 we should consider porting the basic feature of ~"devops:package" to GitLab-core.

Maven Repository and ~"NPM Registry" will not be ported, only the basic Package and PackageFile model.

/cc @jlenny