Replace the docker lib with oras

[Skarlso]

What would you like to be added:

A continuation of #106.

Turns out ORAS had some hickups when we tried to introduce it. It handled some parts of the image layering choices based on MediaType incorrectly.

We need to revisit the implementation and try a smaller scale repository approach in which we just replace the interface usage of the tech/docker package to minimize breaks.

Why is this needed:

[jakobmoellerdev]

Needs at least 2 assignees due to complexity of issue

[Skarlso]

Tests

Most important test is making sure that all blobs behind a manifest are actually available and downloadable.

Reproducing steps:

ocm transfer component --copy-resources ./transport-archive ghcr.io/skarlso/ocm-transfer-test-dev-2 -f
... # also try commontransportarchive
ocm transfer commontransportarchive --copy-resources ./transport-archive ghcr.io/skarlso/ocm-transfer-test-dev-2 -f

Check manifest and manifest blobs

 crane manifests ghcr.io/skarlso/ocm-transfer-test-dev-2/stefanprodan/podinfo
 crane manifest ghcr.io/skarlso/ocm-transfer-test-dev-2/stefanprodan/podinfo:6.2.0@sha256:f60e14b08375a64528113dd8808b16030c771f626e66961dfaf511b74d6f68dc
 crane manifest ghcr.io/skarlso/ocm-transfer-test-dev-2/stefanprodan/podinfo:6.2.0@sha256:1196bd99425758aab0c530b00aeb27c39d09a77435d244025d3161a77460674e
 crane manifest ghcr.io/skarlso/ocm-transfer-test-dev-2/stefanprodan/podinfo:6.2.0@sha256:87e43935515a74fcb742d66ee23f5229bd8ac5782f2810787b23c47325cb963e

Initial Approach

This file api/oci/extensions/repositories/ocireg/namespace.go contains the usage of this interface api/tech/docker/resolve/interface.go. If we can manage to implement this interface with Regclient, it should be possible to more easily replace the docker part without the need to touch how Namespaces are constructed.

Also need to replace getResolver here api/oci/extensions/repositories/ocireg/repository.go which creates the OCI client ( aka. docker client ) to construct the regclient ( or the wrapper to the regclient which implements the interface mentioned before ).

Together with this, hopefully, that's the most thing that needs to be changed with the minimum amount of code change.