Stubber: Allow add_client_error to use expected_params

[Jc2k]

I'd like to be able to use expected_params with add_client_error - it looks like this should be enough?

[codecov-io]

Current coverage is 97.56% (diff: 100%)

Merging #1025 into develop will decrease coverage by 0.04%

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[kyleknap]

If you can add a test for this, that would be great. I would be in favor of pulling this in because I think it would be useful, but we typically need tests for the new functionality to be able to pull it in.

[jamesls]

I'll go ahead and take this and add a test for it. I think this will be really useful. Assigning to myself.

[Jc2k]

Thanks @jamesls! I've been too snowed to get to it 😭

[jamesls]

Merged via #1031.