Support for new effects

[ColOfAbRiX]

Description

As a user of the figlet library I would like to use the Validated applicative to handle figlet errors or, at worse, add support for my own effect.
I would like figlet to have a package that wraps results in Validated and a package that directly exposes the generic effect F[_].

Implementation

Add two new packages in the figlet4s-effects project, one for Validated and one for generic and use the existing packages as starting point to implement this feature.

On a different thought this might require a rethink of the structure of the packages because, like it is now, when importing the effects library a whole lot of unwanted dependencies can be added. I.e. if I want to use support for Either I'm forced to depend on Cats. Do not proceed before taking a decision with this.

Notes

For small, self-contained library like figlet4s I believe in the "battery included" approach and easy integration. For this reason I don't want users to fiddle with conversions to and from effects that they are not currently using in their library and this is why I want to add support for the most common and reasonable effect in the Scala ecosystem.