GH-57: Add Target Method Parameter Definition Model

[kdavisk6]

To better support compile time annotation processors, this change introduces the TargetMethodParameterDefinition model object. Used by our compile time annotation processor and eventually all Contract implementation, this object contains the configuration of an annotated method parameter.

[codecov]

Codecov Report

Merging #64 (4fad8f3) into main (cba47c0) will increase coverage by 0.13%.
The diff coverage is 96.96%.

@@             Coverage Diff              @@
##               main      #64      +/-   ##
============================================
+ Coverage     93.11%   93.24%   +0.13%     
- Complexity      655      667      +12     
============================================
  Files            75       76       +1     
  Lines          1714     1747      +33     
  Branches        186      187       +1     
============================================
+ Hits           1596     1629      +33     
  Misses           66       66              
  Partials         52       52              

Impacted Files	Coverage Δ	Complexity Δ
...re/src/main/java/feign/TargetMethodDefinition.java	95.16% <ø> (ø)	30.00 <0.00> (ø)
...in/java/feign/TargetMethodParameterDefinition.java	96.96% <96.96%> (ø)	11.00 <11.00> (?)
core/src/main/java/feign/support/Assert.java	60.00% <0.00%> (+6.66%)	7.00% <0.00%> (+1.00%)

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