Implement a MVP for kyma app push command

[kwiatekus]

Description

Implement a new kyma app push command that deploys k8s resources that are necessary to transform docker image definition (dockerfile) into an application.

For example (just a proposal at this stage)

//will use Dockerfile from the current folder
kyma app push --name foo 

//will use Dockerfile from the bar folder and use custom port 8080
kyma app push --name foo --dockerfile bar/Dockerfile --expose 8080

//will not build the image but simply use nginx as app's image
kyma app push --name mynginx  --image nginx:latest

AC
The command should:

• should be available in command palette as soon as the connection to cluster is established (kubeconfig context is set)
• locate the dockerfile (lookup in the current folder by default),
• fail if no dockerfile was found and no --image flag was used,
• build the image if needed
• push the image to the registry (the command should read the in-cluster's docker registry config.json) if needed
• fail if --dockerfile option is used but no docker registry module is available in the cluster
• apply deployment (making use of exposed port information read from dockerfile)
• apply k8s service (making use of the port information read from dockerfile)
• (if api-gateway module is enabled) apply api-rule to expose all paths for the default, or user provided port and using the app name as a hostname

The definition of the command should be part of docker-registry module.
Presence of api-gateway module should extend the command's default capability by adding the api-rule on top.

Execution

• push command to deploy an image by name  #2238
• Create k8s service when pushing application via kyma cli #2239
• Allow exposing apps pushed by kyma CLI #2240
• Support image building (by Dockerfile) for apps pushed via kyma CLI  #2241

Reasons
Kyma users need a simple way to deploy containerised application without having any kubernetes knowledge.

[kwiatekus]

Stages:

• create deployment based on --name and --image and --containerPort (3)

kyma alpha app push --name mynginx --image nginx:latest --containerPort xx

• parse dockerfile to read port information and define k8s svc (2)

• detection and support for api-gateway (3)

kyma alpha app push --name mynginx --image nginx:latest --containerPort xx --expose true

• support custom image building (using lib, not docker daemon from host machine) (3)

kyma alpha app push --name myservice  --containerPort xx --expose true --dockerfile .