Use unittest's AsyncMock instead of our AsyncMock

Python 3.8 introduced an `unittest.mock.AsyncMock` class that can be used to mock coroutines and other types of asynchronous operations like async iterators and async context managers. As we were using our custom, but limited, AsyncMock, I have replaced our mock with unittest's AsyncMock.

Since Python 3.8 also introduces a different way of automatically detecting which attributes should be mocked with an AsyncMock, I've changed our CustomMockMixin to use this new method as well. Together with a couple other small changes, this means that our Custom Mocks now use a lazy method of detecting coroutine attributes, which significantly speeds up the test suite.

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