Allow camera HFOV lower than 0.5°

[teyssieuman]

🦟 Bug fix

Fixes #1562

Summary

The current lower HFOV angle (0.1 rad / 5.72958°) for a camera is too high compared to the limit in gz_sensors (0.01 rad).
The proposed modification allow angle as narrow ad 0.5° and above.

Corresponding PR in gz-sensors depot : gazebosim/gz-sensors#520

Checklist

• Signed all commits for DCO
• Added tests
• 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.

[iche033]

looks good to me

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.55%. Comparing base (ff26247) to head (f93d8a3).
Report is 5 commits behind head on sdf15.

Additional details and impacted files

@@            Coverage Diff             @@
##            sdf15    #1563      +/-   ##
==========================================
+ Coverage   92.52%   92.55%   +0.02%     
==========================================
  Files         139      139              
  Lines       18470    18530      +60     
==========================================
+ Hits        17090    17150      +60     
  Misses       1380     1380              

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[scpeters]

@osrf-jenkins run tests please