Filtering and pagination return no results

[PaulWaldo]

Describe the bug
using limit or offset causes results to be empty

To Reproduce
Code to reproduce the error.

def test_working():
    Base = declarative_base()
    class SomeClass(Base):
        __tablename__ = "some_table"
        pk1 = Column(String, primary_key=True)
        name = Column(String(50))

    def __repr__(self):
        return str(self.pk1)

    mock_session = UnifiedAlchemyMagicMock()
    sc = SomeClass(pk1="123", name="test")
    mock_session.add(sc)
    result = mock_session.query(SomeClass).all()
    assert len(result) == 1
    result = mock_session.query(SomeClass).limit(10).all()
    assert len(result) == 1

    # This fails "assert 0 == 1"
    result = mock_session.query(SomeClass).filter(SomeClass.pk1 == "123")
    assert len(result) == 1

    # This fails "assert 0 == 1"
    result = mock_session.query(SomeClass).offset(0).all()
    assert len(result) == 1

Expected behavior
See tests

Screenshots
NA

Desktop (please complete the following information):

• OS: macOS Big Sur
• Version mock-alchemy==0.2.2

Additional context
Add any other context about the problem here.

[rajivsarvepalli]

As of right now, this is one of the many features missing from mock-alchemy. Both limit and offset are not supported features of this library. This is something worth adding, so I will work at some point to add these features. If you have a good idea of how to add this, feel free to open a PR.