Support image building (by Dockerfile) for apps pushed via kyma CLI

[kwiatekus]

Description

For example, such cli command
kyma alpha app push --name myservice --containerPort xx --dockerfile .
should:

• build the image (using a library, not a docker cli from the host machine)
• push the image into in-cluster docker registry
• ensure that docker registry's local pull address is used as image url in the created deployment
• ensure proper imagePullSecret is configured in the created deployment

Reasons
This feature takes off the responsibility to worry about external docker registry while developing new apps in kyma.
This makes it easier to prototype and test.
This provides better learning experience for users who are more familiar with cf api than k8s api

Related
Part of #2236