Add ACTOR and WORLD types to entity

[chapulina]

🎉 New feature

Summary

I noticed that we were missing a couple of entity types in the entity message. Looking at the generated C++ code, I think this change is backwards compatible. Let's see what the ABI checker has to say.

Test it

These are used in this PR:

• Helper function to get an entity from an entity message gz-sim#1595

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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.

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[mjcarroll]

LGTM modulo ABI (Should be good by my recollection)

[codecov]

Codecov Report

Merging #275 (b40c12c) into ign-msgs5 (97ea6f5) will not change coverage.
The diff coverage is n/a.

❗ Current head b40c12c differs from pull request most recent head 9f263c5. Consider uploading reports for the commit 9f263c5 to get more accurate results

@@            Coverage Diff             @@
##           ign-msgs5     #275   +/-   ##
==========================================
  Coverage      85.27%   85.27%           
==========================================
  Files              9        9           
  Lines            903      903           
==========================================
  Hits             770      770           
  Misses           133      133           

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[Kakcalu13]

Sorry for being late but how do we use this in ign commands?