Optimize serverless functions

[nmanovic]

My actions before raising this issue

• [x] Read/searched the docs
• [x] Searched past issues

Current Behaviour

• Serverless functions can accept only images as json strings.
• Serverless functions are called using nuclio dashboard API
• Requests can be only offline (send data to DB)

Possible Solution

• Serverless functions should accept URL on an image as well and download it.
• Call serverless functions directly (instead of dashboard API).
• Allow online requests which can send results to UI (e.g. can be useful for tracker)

Context

If we run "dummy" serverless function which only accepts an image and create a PIL.Image object, the operation will have visible overhead. Need to reduce it.

[KrishavRajSingh]

I would like to work on this.