[Feature] Add support for Env variables and a robyn.yaml config file

[sansyrox]

Current Behavior

Right now, Robyn only allows config variables to be passed as command line arguments.

Desired Behavior

Having it detect a config file at the root of the project will allow a cleaner invocation, which is the ideology of the project.

High Level Implementation

• Add a file detector and parser function (ideally on the rust side) and parse the file contents
• Parse the file contents and look for any overrides through the cli
• Set the config variables in the appropriate places
• Start the application.