[py] deprecate FirefoxBinary class

[titusfortner]

Description

Deprecates the class and the properties on Firefox Options that is the only place the class is used

Motivation and Context

The class was created to manage starting and stopping the browser, which has not been necessary since the move to geckodriver. It is currently only used for storing the location of the browser, which is already duplicated behavior of binary_location() method.

Note: making use of the new deprecated annotation which is nice.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (19df7bb) 58.37% compared to head (df773bf) 58.46%.

❗ Current head df773bf differs from pull request most recent head 3d241f7. Consider uploading reports for the commit 3d241f7 to get more accurate results

Files	Patch %	Lines
py/selenium/webdriver/firefox/options.py	83.33%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #13476      +/-   ##
==========================================
+ Coverage   58.37%   58.46%   +0.08%     
==========================================
  Files          86       86              
  Lines        5266     5270       +4     
  Branches      222      220       -2     
==========================================
+ Hits         3074     3081       +7     
+ Misses       1970     1969       -1     
+ Partials      222      220       -2     

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