Scanorama

Fix namespace deprecation bug https://github.com/brianhie/scanorama/pull/152

Fix warnings, https://github.com/brianhie/scanorama/pull/137

- Update intervaltree dependency to version compatible with Python 3.10

Make compatible with new sklearn nearest neighbors API

**Imporant**: API change to `integrate_scanorama()` and `correct_scanorama()` to preserve .obs, .obsm, .var, and .uns in the corrected output adatas.

Also implements unit testing for the Scanorama package.

Remove custom t-SNE implementation.