feat: Support for mimicking classes

[DrBarnabus]

Adds support for mimicking classes along with the previously supported interfaces provided the class meets some criteria; non-static, non-sealed and accessible by the proxy generator.

Example usage (when class has a parameterless constructor):

var mimickedClass = new Mimic<ClassWithParameterlessConstructor>();

Example usage (when class needs constructor arguments):

var mimickedClass = new Mimic<ClassWithSpecificConstructor>
{
    ConstructorArguments = [1, "arg2", 3m, new object()]
};

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 72.10%. Comparing base (6fdddd7) to head (67df33d).

Files	Patch %	Lines
src/Mimic/Mimic`1.cs	11.11%	7 Missing and 1 partial ⚠️
src/Mimic/Mimic`1.Setup.cs	0.00%	2 Missing ⚠️
...Mimic/Exceptions/UnsupportedExpressionException.cs	50.00%	1 Missing ⚠️
src/Mimic/Mimic`1.VerifyReceived.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   71.65%   72.10%   +0.45%     
==========================================
  Files          60       60              
  Lines        1937     1972      +35     
  Branches      335      341       +6     
==========================================
+ Hits         1388     1422      +34     
- Misses        482      483       +1     
  Partials       67       67              

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