Document HighThroughputMint implementation

Users need documentation that explains the High Throughput Minting implementation, including:

Background, explanation of the problem it was designed to solve. Why the original / legacy MintToken operation is not sustainable, scalable, or performant

Tradeoffs, limitations, assumptions, or known brittleness with the approach and why these decisions or tradeoffs were made

Links to relevant Hyperledger Fabric concepts that explain the above

High level explanation of how the functions work, how they interact with world state, and how they get around the MVCC_READ_CONFLICT errors inherent to Hyperledger Fabric

Detailed user guide for Token Authorities, developers, and end users interacting with mint-related methods from existing or future applications, websites, or gala-connect

Function, class, and method specific TypeDoc documentation comments that will propagate to the relevant auto-generated module documentation for @gala-chain/api, @gala-chain/chaincode, and others