Refactor oci client

[souleb]

The client in pkg/oci can be refactored to include some optimization:

• use remote instead of crane like in https://github.com/fluxcd/source-controller/pull/1244
• provide a client that can be used in both source-controller and flux2.
• optimize for large files download/uploads

Tasks:

• [ ] optimize for large files download using http key range where possible #738
• [ ] switch from crane to remote
• [ ] enable OCI client in SC