[DEVEX-89] Add Changeset

[balanza]

Add Changesets.

The proposed usage is:

• When opening a PR, add a changeset file (if needed) explaining which packages have been modified and how (patch/minor/major)
• Review all changes before releasing in the automatically-created Version Packages pull request
• When merged, a release would be created for each changed app or package; each release entry will contain the bundle with the pruned monorepo for the workspace.
• (Next) When publishing, the bundle can be downloaded to be built, packed, and published/deployed as needed

Depends on #5

[dpulls]

🎉 All dependencies have been resolved !

[balanza]

@BurnedMarshal @lucacavallaro I'm open to suggestions on how to test these changes.

I tried with https://github.com/nektos/act, but in the end, the Changesets action will try to connect to this GitHub repository to manipulate it.