feat(gql): schema for UMAPoints (#196)

* initial strawman of UMAPoints

* remove notebook changes

* Add UMAP data to the straw-man

* add strawman for clusters

* add time range input

* flesh out metadata fields for the embedding

* Add embedding metadata

* fix package.json

* Add n_components

* add umap hyperparameters

* Add descriptions

* update schema

* clear out notebooks

* Add defaults to params

* Add typing extensions

* fix annotation

* move to typing extensions

* swtch min_dist to float

* black fix

* Fix union type