[Feature] Contract CI/CD and checks

[bitbeckers]

Goal

Work on code quality and get automated feedback on contract state

User stores

• [x] #58
• [x] #59
• [x] #60
• [x] As a developer, I want to publish a NPM package when creating a release with typed contracts (see: #50)

Resources:

• Gas report and test coverage via Foundry
• Slither in GitHub actions

[brossetti1]

https://github.com/Network-Goods/hypercerts-protocol/pull/86 adding this as a reference for bullet point 2