Formalizes fixes for #19 by dropping configurations and defaulting the keep-listening behavior

[mattsilber]

These changes are all related to #19:

• Drops configurations for setUsePreDrawOverGlobalLayoutEnabled. Using the OnPreDrawListener over the OnGlobalLayoutListener did not solve the underlying issue; it just delayed the start of the sizing process under normal cases.
• Drops configurations for setAttemptLastDitchPostForLayoutResolutionFailure. The last-ditch post on receiving invalid sizes caused more harm than good.
• Drops configurations for setKeepListeningForDrawUntilValidSizeDiscovered. The continued listening for a valid size was the ultimate fix and has become the default behavior moving forward.
• Adds migration guide noting the signature changes for what will be version 4.0.0

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 83.63%. Comparing base (c918af5) to head (d687de6).

Files	Patch %	Lines
...jackpocket/scratchoff/ScratchableLayoutDrawer.java	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
- Coverage   83.76%   83.63%   -0.13%     
==========================================
  Files          10       10              
  Lines         659      611      -48     
  Branches       81       76       -5     
==========================================
- Hits          552      511      -41     
+ Misses         73       67       -6     
+ Partials       34       33       -1     

Flag	Coverage Δ
unit	83.63% <80.00%> (-0.13%)	⬇️

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