add weightwatchers plugin

[cdreetz]

TL;DR

New plugin for using weightwatcher model analyzer

Type

• [ ] Bug Fix
• [ ] Feature
• [x] Plugin

Are all requirements met?

• [x] Code completed
• [x] Smoke tested
• [x] Unit tests added
• [ ] Code documentation added
• [ ] Any pending items have an associated Issue

Complete description

Add weightwatcher plugin based on get started tutorial here https://github.com/CalculatedContent/WeightWatcher User has a model, applies 'Analyze' and is returned a df on the layer details of the model, displayed in Decks

Tracking Issue

https://github.com/flyteorg/flyte/issues/3013

Follow-up issue

NA

[kumare3]

@cdreetz is this ready to be reviewed? cc @eapolinario / @pingsutw did any of you review this

[kumare3]

cc @cosmicBboy