Added example of how to use without mocking framework

[natehitze]

PR Details

Added extension method for IEnumerable<T> that simply returns new TestAsyncEnumerableEfCore<T> for the input enumerable.

Using TestAsyncEnumerableEfCore<T> directly instead of going through a mocking framework is much faster. See the related issue for benchmark and details. It should behave the same way since all BuildMock does is forward interface calls to the underlying TestAsyncEnumerableEfCore anyway.

Related Issue

55

How Has This Been Tested

New test class (MyServiceNoMockTests) with tests copied from MyServiceMoqTests converted to not use Moq.

Checklist

• [x] My code follows the code style of this project.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.