chore: create a release notes configuration

[nicomiguelino]

Description

• Created a release.yml so that automatically-generated release notes are grouped according to the type of changes made
• Update PR process docs in CONTRIBUTING.md so it's clear that at least one label must be linked to a pull request.

Checklist

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation (where applicable).
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

References

• See this GitHub documentation for more details.