Modify modulation property names

[mhostetter]

• Fixes Rename bps to bits_per_symbol #398
• Fixes Rename sps to samples_per_symbol #397
• Renames rate to code_rate
• Fixes Add symbol_rate=1 kwarg to modulation classes #366

[codecov-commenter]

Codecov Report

❌ Patch coverage is 84.89209% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.51%. Comparing base (c521790) to head (c1a7242).
⚠️ Report is 185 commits behind head on release/0.0.x.

Files with missing lines	Patch %	Lines
src/sdr/_modulation/_linear.py	76.47%	8 Missing ⚠️
src/sdr/_modulation/_cpm.py	76.66%	7 Missing ⚠️
src/sdr/_modulation/_psk.py	50.00%	5 Missing ⚠️
src/sdr/_modulation/_msk.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           release/0.0.x     #401      +/-   ##
=================================================
- Coverage          79.59%   79.51%   -0.09%     
=================================================
  Files                 63       63              
  Lines               3931     3963      +32     
=================================================
+ Hits                3129     3151      +22     
- Misses               802      812      +10     

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