Integrate changesets for package versioning

[Igorbek]

This PR integrates changesets as a tool for streamlining package versioning and releasing.

The overall release process would be the following:

• each changelog contribution would be described in a file created by yarn changeset
• after updating master, a new PR is created by version.yml workflow (and changesets) that is a pending release
• multiple changes can be done before the release PR gets merged
• the release PR would contain (automatically generated):
  • update to changelog file
  • updates to package versions
• when Release PR gets merged:
  • version.yml workflow would create a tag and GitHub release with the corresponding changelog
  • publishing the version would trigger release.yml workflow (exists today)
• after the first change a new Release PR would be created again