Support mocking delegate types (#48)

[tillig]

Fixes #48.

Problem

AutoMock.Mock<T>() cast the resolved object to IMocked<T>:

var obj = (IMocked<T>)Create<T>(true, parameters);
return obj.Mock;

For interfaces and classes, Moq's proxy .Object implements IMocked<T>, so this works. But for a delegate mock, .Object is the delegate itself and does not implement IMocked<T>, so the cast threw:

Unable to cast object of type 'MyDelegate' to type 'Moq.IMocked`1[MyDelegate]'.

Fix

Use Moq.Mock.Get(...) instead of the cast. Mock.Get retrieves the Mock<T> from Moq's internal registry rather than relying on the resolved object implementing IMocked<T>, so it works for delegate mocks as well as interfaces and classes.

Tests

Added a regression test that mocks a delegate type, sets it up, and invokes it. Full suite passes (49 tests).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.90%. Comparing base (595df74) to head (5623078).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #60      +/-   ##
===========================================
- Coverage    90.99%   90.90%   -0.09%     
===========================================
  Files            3        3              
  Lines          111      110       -1     
  Branches        21       21              
===========================================
- Hits           101      100       -1     
  Misses           6        6              
  Partials         4        4              

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