Fix imports for hyppo >= 0.2.0

[j1c]

I'd like to use new hyppo features in versions >=0.2.0, and dealing with two versions of hyppo in environments is getting annoying.

Reference Issues/PRs

Fixes #659.

What does this implement/fix? Briefly explain your changes.

• Removed much of the code that deals with metric functions since hyppo now natively supports all options in sklearn.metrics.pairwise.kernel_metrics and sklearn.metrics.pairwise.paired_distances. This way, we dont have to import the gaussian kernel function.
• Warning were raised when pairing kernel metrics + distance-based tests or distance metrics + kernel-based tests, which was introduced in Latent distribution test size #366. This behavior was changed so that kernel metrics must be paired with kernel-based test (HSIC), and similarly for distance. Otherwise, error is thrown.
  • Reasoning is that hyppo doesn't allow this mismatch so doesn't make sense for graspologic to allow mismatches.
• In Latent distribution test size #366, the defaults were "changed" to test=HSIC and metric=gaussian, but that was only changed in the docstring, not the actual code. Changed this back to test=dcorr and metric=euclidean in the docstring.
  • I dont have an opinion on what the actual default should be. But given that the code was never changed, I just changed the docstrings back. Perhaps outside of the scope of this PR to make this decision.
• Sorted imports

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[bdpedigo]

i like dcorr/euclidean as the default