Setup automatic changelogs

This MR adds and sets up the @semantic-release/changelog package which will create and automatically update a CHANGELOG.md file at the project's root. This was requested during one of the working group's meetings.

Additionally, all semantic-release packages have been upgraded to their latest version which seemed reasonable considering that none of the reported breaking changes should affect us. Here's a list of the breaking changes for reference:

Breaking changes reported in upgraded dependencies

@semantic-release/gitlab

v4.0.0

• require GitLab version >= 11.7

v3.0.0

• require semantic-release >= 15.8.0 (we were already using v15.8.1)

@semantic-release/npm

v5.0.0

• require semantic-release >= 15.9.0 (we're now using v15.13.31)