Contains doesn't work on guids

[pdevito3]

a test like this should pass

    [Fact]
    public async Task can_filter_by_guid_contains()
    {
        // Arrange
        var testingServiceScope = new TestingServiceScope();
        var fakePersonOne = new FakeTestingPersonBuilder().Build();
        var fakePersonTwo = new FakeTestingPersonBuilder().Build();
        await testingServiceScope.InsertAsync(fakePersonOne, fakePersonTwo);

        var input = $"""{nameof(TestingPerson.Id)} @=* "{fakePersonOne.Id}" """;

        // Act
        var queryablePeople = testingServiceScope.DbContext().People;
        var appliedQueryable = queryablePeople.ApplyQueryKitFilter(input);
        var people = await appliedQueryable.ToListAsync();

        // Assert
        people.Count.Should().Be(1);
        people[0].Id.Should().Be(fakePersonOne.Id);
    }