[POC] Command to push custom image to in-cluster docker registry

[kwiatekus]

Description

Design and implement a prototype for a command in kyma cli that would allows pushing custom image into in cluster docker registry from developer's machine or CI/CD workflow.

User's input:

• image name and tag (cli checks address and port and complements the image url so that nodes can schedule the images)

Reasons

This feature would make it easy for users to test their applications on kyma runtime.
Currently, when users want to deploy their code to the cluster he faces the fact that there is no SAP registry available. We want to look weather we can close the gap to CF-like experience where a cf push does all the work necessary to deploy the code.

Part of kyma-project/kyma#18555
Part of kyma-project/kyma#18198