Refactor basicRegionList is rest.ts

[marySalvi]

export async function basicRegionList( limit?: number, offset?: number, q?: Polygon | MultiPolygon, predicate?: string | null, acquiredAfter?: string | null, acquiredBefore?: string | null, distanceMin? : string | null, distanceMax? : string | null, regionId? : string | null,

"Rather than have this many position-dependent but optional arguments, we should make basicRegionList accept just one Object-typed argument and bring this specification out as an Object interface." -Zach

This should be done for any other call following this pattern as well