[Feature] SDK for mutating hypercerts

[bitbeckers]

Goal

Allow for splitting, merging and burning hypercerts

User stories

• As a developer, I want to be able to pull the SDK from npm so I can split a hypercert in a set of fractions
• As a developer, I want to be able to pull the SDK from npm so I can merge fraction of a hypercert
• As a developer, I want to be able to pull the SDK from npm so I can burn a full hypercert

Technical

• Store per fraction metadata on IPFS
• Input validations for splitting, merging and burning
• Generate appropriate image representing the effect of the mutation and update metadata

Interface

Metadata

• generate()
• update()
• read()

Hypercerts

• split()
• merge()
• burn()