Add keywords and foodish image models

[surhud004]

FEATURE: Task - Add keywords and foodish image models

Summary -

• Add keywords to pizza category (beta feature) (details mentioned in the comment below)
• Add foodish image models
• Update image fetch: improvised logic and faster performance
• Add codeowners and branch protection rules

Testing -

• Test image check locally

[surhud004]

BETA FEATURE:

Added keywords to the pizza food category of the Foodish database. An example use-case to filter only vegetarian pizzas could be as follows:

https://foodish-api.herokuapp.com/images/pizza/?keyword=vegetarian

or if using the /api path:

https://foodish-api.herokuapp.com/api/images/pizza/?keyword=vegetarian

For a complete list of available keywords and for more details about this feature, please follow the discussion article here.
This partially fixes #11 so it would still remain open to be worked on.