Add support for bayer images to be saved in a directory

[tejalbarnwal]

🎉 New feature

Closes gz-sensors issue 299

Sub-Tasks

• Support simulation for BAYER_RGGB8 with OGRE
• Extend the functionality to support all bayer types with OGRE
• Extend the functionality to support with OGRE2

Summary and Related PRs

The functionality reads the user input and renders an RGB image, which is later converted into a single channel 8bit Bayer image using ConvertRGBToBayer() added to Utils.cc inside gz-rendering.

• gz-sensors : Adds a switch case for RGGB bayer format inside CameraSensor.cc and passes the R8G8B8 format to render the image.
• gz-redering : Adds ConvertRGBToBayer() to Utils.cc, modifies OgreRenderTarget.cc to call the conversion function, and handles image format conversion functions with if-else statements.
• gz-gui : Adds switch cases to display Bayer images in Gazebo GUI inside. It treats them as single-channel 8-bit images.
• gz-common : Modifies Image::SetFromData inside Image.cc to support saving of Bayer images. In order to save it It treats them as single-channel 8-bit images.

Test it

In order to test this, one can modify camera_sensor.sdf inside gz-sim here. Would have just to replace the part with the following snippet.

<image>
   <width>320</width>
   <height>240</height>
   <format>BAYER_RGGB8</format>
</image>
<clip>
   <near>0.1</near>
   <far>100</far>
</clip>
<save enabled="true">
    <path>path to the folder</path>
</save>

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.

[codecov]

Codecov Report

Merging #498 (1c1cebd) into gz-common5 (95320c3) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

❗ Current head 1c1cebd differs from pull request most recent head 44c5be6. Consider uploading reports for the commit 44c5be6 to get more accurate results

@@              Coverage Diff               @@
##           gz-common5     #498      +/-   ##
==============================================
- Coverage       83.71%   83.67%   -0.05%     
==============================================
  Files              90       90              
  Lines           10242    10247       +5     
==============================================
  Hits             8574     8574              
- Misses           1668     1673       +5     

Impacted Files	Coverage Δ
graphics/src/Image.cc	88.82% <0.00%> (-1.33%)	⬇️

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