Add licenses to packages

[HCastano]

This PR fills out the license fields of all the packages in the repo, and assigns different licenses depending on the code.

• For core code, AGPL-3.0 was used to match the rest of our projects
• For examples, the Unlicense was used to put this code into the public domain
• For the RISC Zero example, Apache-2.0 was used to comply with the license requirements of the code used from the RISC Zero project

The motivation for licensing the examples as permissively as possible is to allow teams to get started with Entropy without fear of "infecting" their project with GPL licensed code.

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Name	Status	Preview	Comments	Updated (UTC)
constraints	❌ Failed (Inspect)			Dec 15, 2023 7:38pm