Add getters and setters for RX/TX data rates

[M-C-machts]

Fixes #374

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.67%. Comparing base (3ff829d) to head (3036455).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #401   +/-   ##
=======================================
  Coverage   90.67%   90.67%           
=======================================
  Files         119      119           
  Lines        6608     6608           
  Branches      308      308           
=======================================
  Hits         5992     5992           
  Misses        616      616           

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[PatrickKa]

Setting the RX data rate is still missing.