[hotfix][sdk] update cmake structure

[tijyojwad]

Update cmake structure for better integration with other tools that use GW as cmake submodule.

Keep only one project for GW, and remove "project" settings from all modules.

[ohadmo]

Looks good. Just one question: why is it a hotfix?

@tijyojwad to put the auto release job to the test? (for a hotfix) :smile:
The release commit will also contain the updated ./VERSION file

[ahehn-nv]

:) that's a good reason.