Support more CRSes (that are supported on Sentinel Hub) or add an option to "add" your own

[zcernigoj]

"Adding" other CRSes by library users would mean exporting CRS type and would also mean some things might not work correctly. This is already used in some applications (occurrence 1, occurrence 2), and since the type CRS is not exported, causes an additional problem.

Ideally other CRSes (that are supported on Sentinel Hub) would be natively supported in sentinelhub.js.