Added Error Python interface

[ahcorde]

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

🎉 New feature

This PR is part of this mete ticket #931

Summary

Added Error Python interface

Test it

from sdformat import Error

error = Error(Error.FILE_READ, "Unable to read a file")
print(error.message())
print(error.code())

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 #933 (010c2aa) into main (266d452) will decrease coverage by 0.02%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##             main     #933      +/-   ##
==========================================
- Coverage   88.16%   88.14%   -0.03%     
==========================================
  Files         100      102       +2     
  Lines       14637    14706      +69     
==========================================
+ Hits        12905    12962      +57     
- Misses       1732     1744      +12     

Impacted Files	Coverage Δ
python/src/sdf/pyError.cc	81.53% <81.53%> (ø)
python/src/sdf/_ignition_sdformat_pybind11.cc	100.00% <100.00%> (ø)

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[scpeters]

this doc-string is incorrect