fix: add changelog file

[allisonsuarez]

Summary of Changes

Added CHANGELOG.md file to persist the changes from the new release, as well as preventing a new release from happening if the setup.py file is changed without a version bump. Release publishing should be triggered when both setup.py and CHANGELOG.md have been changed.
CHANGELOG.md should be overwritten every time and only contain the changes in the newest release.

Tests

Documentation

CheckList

Make sure you have checked all steps below to ensure a timely review.

• PR title addresses the issue accurately and concisely. Example: "Updates the version of Flask to v1.0.2"
  • In case you are adding a dependency, check if the license complies with the ASF 3rd Party License Policy.
• PR includes a summary of changes, including screenshots of any UI changes.
• PR adds unit tests, updates existing unit tests, OR documents why no test additions or modifications are needed.
• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public python functions and the classes in the PR contain docstrings that explain what it does
• PR passes all tests documented in the developer guide