feat(`forge init`): add `--vyper` flag to initialize a basic `Vyper` project mirroring `Counter`

[zerosnacks]

Component

Forge

Describe the feature you would like

Now that we have Vyper support it would be great to be able to quickly instantiate a Vyper project. This would help with setting up quick reproductions as well as lowering the barrier to entry for users to get started with Vyper in Foundry.

In the future other flags could be added to extend this behavior (--yul, etc..)

Additional context

There is currently a --template parameter to pass in a template repository but we do not maintain one