Anti-aliasing element for <camera><image>

[WilliamLewww]

🎉 Anti-aliasing element for <camera><image>

Related pull requests:

• Support <anti_aliasing> element when setting up camera render texture gazebo-classic#3201

Summary

Adds the <anti_aliasing> element to <camera><image>.

Anti-aliasing is always associated with a value (usually for the filter size).
<anti_aliasing> is the value that will be used by the anti-aliasing type.

When engines continue to support different anti-aliasing types (currently OGRE1 and OGRE2 only use MSAA), an attribute (type="MSAA") can be added to the element.

<camera name="camera">
  <image>
    <width>640</width>
    <height>480</height>
    <format>R8G8B8</format>
    <anti_aliasing>4</anti_aliasing>
  </image>
...
</camera>

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• 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.

[codecov-commenter]

Codecov Report

Merging #909 (72f5aca) into sdf9 (41ad073) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 72f5aca differs from pull request most recent head 08f0bdd. Consider uploading reports for the commit 08f0bdd to get more accurate results

@@           Coverage Diff           @@
##             sdf9     #909   +/-   ##
=======================================
  Coverage   87.56%   87.57%           
=======================================
  Files          63       63           
  Lines        9894     9901    +7     
=======================================
+ Hits         8664     8671    +7     
  Misses       1230     1230           

Impacted Files	Coverage Δ
src/Camera.cc	81.60% <100.00%> (+0.34%)	⬆️

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