Remove separate treatment queries

[nleanba]

See factsmission/synospecies#128

Note that this is a significant and breaking API change.
Do not merge without also updating synospecies.

These Types have changed:

export type TreatmentDetails = {
  materialCitations: MaterialCitation[];
  date?: number;
  creators?: string;
  title?: string;
};

export type Treatment = {
  url: string;
  details: Promise<TreatmentDetails>;
};

export type TaxonName = {
  uri: string;
  treatments: {
    aug: Set<Treatment>;
    cite: Set<Treatment>;
  };
  loading: boolean;
};

type Treatments = {
  def: Set<Treatment>;
  aug: Set<Treatment>;
  dpr: Set<Treatment>;
  cite: Set<Treatment>;
};
export type JustifiedSynonym = {
  taxonConceptUri: string;
  taxonName: TaxonName;
  taxonConceptAuthority?: string;
  justifications: JustificationSet;
  treatments: Treatments;
  loading: boolean;
};

The type TreatmentSet has been removed.

Also SynonymGroup has gained two new fields:

export default class SynonymGroup implements AsyncIterable<JustifiedSynonym> {
  ...
  treatments: Map<string, Treatment> = new Map();
  taxonNames: Map<string, TaxonName> = new Map();
  ...
}

They are primarily for internal use, and notably don't have their own async iterators, but they might still be useful for applications.
Both are only updated when a new taxon concept is found.

[retog]

On the left on this PR, on main. Why are no more treatments shown?

[nleanba]

On the left on this PR, on main. Why are no more treatments shown?

This was because the script in index.html was not updated and ran into errors. I have fixed it now

[retog]

Revert back to throwing exceptions, except there's a good reason.

Otherwise it looks good!

Requested changes have been implemented