Add API server to serve tesseract.js

[dyc3]

• add bare minimum for api-server
• add optic middleware for monitoring http api changes
• add some type annotations, and add multer package
• implement upload endpoint
• integrate optic better
• add api docs via optic

This adds a seperate API server with a single endpoint to upload an image, with the response being the recognized text.

[dyc3]

I'll add a readme