[Paywalls V2] Adds StickyFooterComponent

[JayShortway]

As the title says.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.03%. Comparing base (426930e) to head (1c6a7e1).

Files with missing lines	Patch %	Lines
...hases/paywalls/components/StickyFooterComponent.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                       Coverage Diff                       @@
##           pw2-purchasebuttoncomponent    #1934      +/-   ##
===============================================================
- Coverage                        82.04%   82.03%   -0.01%     
===============================================================
  Files                              255      256       +1     
  Lines                             8369     8371       +2     
  Branches                          1206     1207       +1     
===============================================================
+ Hits                              6866     6867       +1     
  Misses                            1011     1011              
- Partials                           492      493       +1     

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[joshdholtz]