Prepare for 2.1.0 Release

[azeey]

🎈 Release

Preparation for 2.1.0 release.

Comparison to 2.0.0: gz-utils2_2.0.0...azeey:prep_2.1.0

Checklist

• Asked team if this is a good time for a release
• There are no changes to be ported from the previous major version
• No PRs targeted at this major version are close to getting in
• Bumped minor for new features, patch for bug fixes
• Updated changelog
• Updated migration guide (as needed)
• Link to PR updating dependency versions in appropriate repository in gazebo-release (as needed):

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #109 (5a2e31a) into gz-utils2 (c6ac4dd) will not change coverage.
The diff coverage is n/a.

❗ Current head 5a2e31a differs from pull request most recent head 097bec5. Consider uploading reports for the commit 097bec5 to get more accurate results

@@            Coverage Diff             @@
##           gz-utils2     #109   +/-   ##
==========================================
  Coverage      79.45%   79.45%           
==========================================
  Files              8        8           
  Lines            331      331           
==========================================
  Hits             263      263           
  Misses            68       68