Add encoders

[Josh-McFarlin]

Changed

• Simplify transformers by removing buffer dependency for external transformers, move sharp
  transformer to examples, and create wasm transformer
• BREAKING: Modified transformer to use a new function type, Sharp can no longer be passed in
  as is
• modify how transform defaults are set and their types

Docs

• Updated docs to use new transformer format
• Created multiple new examples for various transformers
• Created documentation for new usage of Sharp