Add includeTar/includeTools in sync block

[loosebazooka]

This would allow containers that otherwise do not have the necessary container side tooling to use the skaffold sync features.

sync:
  includeTar: true
  # or 
  includeTools: true

more context: #2901 (comment)

[balopat]

In principal I'm okay with solving the issue of missing tar tools.

However, I do have questions towards directly adding tar tools to the container:

1. Do we have to worry about compatibility issues across different base images / architectures ?
2. if we would do this via a package manager command and altering the build def, that would solve 1) but it seems hard
3. Maybe we could use an Ephemeral container that would have guaranteed tar tooling, and kubectl cp would be implemented through that?