[Feature] Allowlisted minting of hypercert fractions

[bitbeckers]

Goal

Create a flow for distributing hypercerts with a predefined set of fractions, creators and claims

User stories

• As a coordinator, I want to be able to 'reserve' hypercert fractions for a given set of contributors
• As a developer, I want to be able to use the SDK to create and store allowlists for hypercert fraction minting
• As a user, I want to be prompted in the app that there are fractions ready to be minted

Technical

Closely related to #33 but with the specific case of minting fractions for a whitelisted set of users within a single hypercert