Add throttling data to message and API

[m-aciek]

Proposed changes

Add throttling data to message and API.

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature. (no docs for Python API)
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

[codecov]

Codecov Report

Merging #456 (6f9cb2f) into main (088cfe8) will decrease coverage by 0.12%.
The diff coverage is 85.71%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #456      +/-   ##
==========================================
- Coverage   99.08%   98.97%   -0.12%     
==========================================
  Files           6        6              
  Lines        1645     1655      +10     
  Branches      215      217       +2     
==========================================
+ Hits         1630     1638       +8     
  Misses          8        8              
- Partials        7        9       +2     

Files Changed	Coverage Δ
wlc/__init__.py	97.57% <83.33%> (-0.44%)	⬇️
wlc/test_base.py	94.89% <100.00%> (ø)
wlc/test_wlc.py	100.00% <100.00%> (ø)

[m-aciek]

mypy fails to recognize the existence of the docstring on the error class. (I've filed a ticket for that.) I'm going to add a cast as a workaround.

[nijel]

Merged, thanks for your contribution!