convert to monorepo?

[DanielJDufour]

Should we convert georaster source code to a monorepo like

• georaster-geotiff: parses geotiffs into georaster
• georaster-image: parse png/jpg (with world files) into georaster
• georaster-all: parses all support input types into georaster

Maybe converting to a monorepo could organize thing and allow people who just want the geotiff functionality from having to downloading all the other stuff.