Endpoint Parameter Registration

[viceroypenguin]

• Change default parameter registration on POST/PATCH/PUT to use [FromBody]
• Add the ability to override default registration with a custom registration

Fixes #27

[codecov]

Codecov Report

Attention: Patch coverage is 79.41176% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 91.35%. Comparing base (439b187) to head (814e518).

Files	Patch %	Lines
src/Immediate.Apis.Shared/EndpointRegistration.cs	0.00%	4 Missing ⚠️
...pis.Generators/ImmediateApisGenerator.Transform.cs	83.33%	1 Missing and 1 partial ⚠️
...Immediate.Apis.Generators/ITypeSymbolExtensions.cs	94.11%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   92.05%   91.35%   -0.71%     
==========================================
  Files          18       19       +1     
  Lines         579      613      +34     
  Branches       61       67       +6     
==========================================
+ Hits          533      560      +27     
- Misses         18       23       +5     
- Partials       28       30       +2     

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