[policy] Use conventional commit format

Problem/Motivation

We want to be able to automate as much as possible for release management.

Proposed resolution

Set up semantic-release to automatically bump versions and create changelogs. Using this tools means making use of a more conventional commit format such as: https://www.conventionalcommits.org/en/v1.0.0/ and enforcing this standard with a tool such as commitizen

The only addition to this would be to define a "Credit" or "By" footer listing all users to be credited for a particular issue/commit..

An example of a commit (taken from once history):

fix(once): Error when context.querySelector() doesn't find an element on the page

Credits: nod_, Danny Englander, droplet
Refs #3204168

Here the (once) is optional, in the mono repo we might want to explicitly tell which package we're handling (semantic release tools don't need it to know which package is impacted by the commit, so totally optional, only for humans).