feat!: collapse all clients into one

[Gozala]

Collapses all clients into a single w3up-client

For backwards compatibility access-client and upload-client simply re-export their former modules which they import from the w3up-client. Please note that I have not done any real cleanup here simply moved files around, we can clean things up in the future.

I think we can release these versions on npm and then deprecate them and remove from the repo.