GH-57: Adding Annotation Processor Skeleton

[kdavisk6]

This change introduces the skeleton for our Annotation Processor,
that will allow users to choose between our default runtime target
generator and a compile-time alternative.

[codecov]

Codecov Report

Merging #63 (a43a326) into main (95db533) will decrease coverage by 0.10%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main      #63      +/-   ##
============================================
- Coverage     93.22%   93.11%   -0.11%     
  Complexity      655      655              
============================================
  Files            74       75       +1     
  Lines          1712     1714       +2     
  Branches        186      186              
============================================
  Hits           1596     1596              
- Misses           64       66       +2     
  Partials         52       52              

Impacted Files	Coverage Δ	Complexity Δ
...ign/annotation/FeignTargetAnnotationProcessor.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)

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