GitLab

* Remove some direct access to sketch.Sketch

* Moved `LoadSketch` command in the proper place

* Removed some accesses to sketch.Sketch

The required information are returned from LoadSketch.

* Added SetSketchDefaults gRPC call

This allows to finally remove wrong access to `sketch.Sketch` from `cli`
package.

* Updated docs

* Fixed integration tests

* Update rpc/cc/arduino/cli/commands/v1/commands.proto
Co-authored-by: Alessio Perugini <alessioper.98@gmail.com>

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Co-authored-by: Alessio Perugini <alessioper.98@gmail.com>