Add new analysis and code fixers

[joeldickson]

38 senarios covered in new fixer

Code is horrible, but will refactor later, as we have a passing test now.

Want to try it out and get more scenario plus test coverage before refactoring

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 78.64407% with 126 lines in your changes missing coverage. Please review.

Project coverage is 78.64%. Comparing base (9be4bce) to head (88c9b09).

Files with missing lines	Patch %	Lines
...uldly.FromAssert/NUnitToShouldlyCodeFixProvider.cs	77.75%	88 Missing and 37 partials ⚠️
src/Shouldly.FromAssert/NUnitToShouldlyAnalyzer.cs	96.42%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #9       +/-   ##
===========================================
- Coverage   92.19%   78.64%   -13.56%     
===========================================
  Files           3        2        -1     
  Lines         141      590      +449     
  Branches       12       60       +48     
===========================================
+ Hits          130      464      +334     
- Misses          9       88       +79     
- Partials        2       38       +36     

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