OpenZeppelin/canton-stablecoin: simple-token/daml/SimpleToken/Rules.daml

Daml contract source - OpenZeppelin/canton-stablecoin/simple-token/daml/SimpleToken/Rules.daml ```daml -- | SimpleTokenRules: the factory contract implementing TransferFactory and AllocationFactory. -- Supports multiple instruments via supportedInstruments list. -- Implements 3-way transfer dispatch