release: prepare analytics 0.24.0

[github-actions]

Release analytics 0.24.0

This PR prepares the analytics module for release.

Changes

• Bumps version to 0.24.0 in packages/mixpanel/package.json
• Updates packages/mixpanel/CHANGELOG.md with a new section since the last v* tag
• Updates packages/mixpanel/readme.md version header

After merging

1. Push tag v0.24.0 from the merge commit on master to trigger the publish workflow:

   git checkout master && git pull
   git tag v0.24.0
   git push origin v0.24.0
   

2. The publish workflow creates a draft GitHub release and publishes to npm. Review and publish the GitHub release after the workflow finishes.