Added Heightmap, HeightmapBlend and HeightmapTexture Python interfaces

[ahcorde]

Signed-off-by: ahcorde ahcorde@gmail.com

🎉 New feature

This PR is part of this mete ticket #931

Summary

Added Heightmap, HeightmapBlend, HeightmapTexture Python interfaces

Test it

from sdformat import Heightmap, HeightmapBlend, HeightmapTexture

heightmap = Heightmap()
heightmapBlend = HeightmapBlend()
heightmapTexture = HeightmapTexture()

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 #993 (9b83bb4) into main (7baa3ee) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #993   +/-   ##
=======================================
  Coverage   66.66%   66.66%           
=======================================
  Files           2        2           
  Lines          27       27           
=======================================
  Hits           18       18           
  Misses          9        9           

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[codecov]

Codecov Report

Merging #993 (dc2269e) into main (5f3031e) will decrease coverage by 0.11%.
The diff coverage is 61.70%.

@@            Coverage Diff             @@
##             main     #993      +/-   ##
==========================================
- Coverage   83.64%   83.53%   -0.12%     
==========================================
  Files         146      147       +1     
  Lines       18255    18349      +94     
==========================================
+ Hits        15269    15327      +58     
- Misses       2986     3022      +36     

Impacted Files	Coverage Δ
python/src/sdf/pyHeightmap.cc	60.43% <60.43%> (ø)
python/src/sdf/_ignition_sdformat_pybind11.cc	100.00% <100.00%> (ø)

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