Add SKQD tutorial

[kevinsung]

Fixes #3003

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[Eric-Arellano]

I think you'll need to add this to notebook-testing.toml. ./check should complain

[jenglick]

@kevinsung Thanks! I left some comments via the ReviewNB app here.

[nathanearnestnoble]

@miamico

[nathanearnestnoble]

Thanks Kevin! I think it is fairly solid, some minor feedback:

• I think it would be useful to reference our Krylov tutorial as well, in case people want to gain a deeper understand of the specifics around it
• @miamico made a good point that I wanted to raise: As you are specifically using the impurity anderson hamiltonian from the paper, you need to introduce an additional step of changing from position basis to momentum basis. I think there could be a benefit to have two component to the tutorial: a simpler hamitlonian that does not require this mapping because it is already sparse, and then a second "more advanced" part II highlight the specific step of basis change to overcome the issue of having a non-sparse matrix and is brief on other elements of the workflow already discussed.