Publish `@semaphore-protocol/contracts` as a package in the `soldeer` package registry.

[ultraviolet10]

It would be ideal to be able to easily install the semaphore contracts as a dependency in any Foundry project. Soldeer is a recently introduced package manager for Foundry.

Soldeer outlines the process for publishing a set of contracts as a package here. For any additional help, I believe the team may provide more context into how to seamlessly achieve this.