updated watchlists endpoint

[bandwiches]

removed depracated watchlist

Watchlists URI was deprecated from Dough and is now served under the TastyWorks API.

Solution

• Moved watchlists from Dough package to ./TastyWorks/Models
• Updated URI
• Updated class method to accept a TastyWorks session (auth required)

Checklist

• PR commits have been squashed Yes
• All tests pass I'm not adept enough to know what I'm doing here
• Code adheres to contributing guidelines Yes

[bandwiches]

Sorry for the delay, I think I got everything updated on my end!

[bandwiches]

@boyan-soubachov is this still relevant?