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

Daml contract source - OpenZeppelin/canton-stablecoin/simple-token/daml/SimpleToken/Holding.daml ```daml -- | Holdings for the simple token standard implementation. -- SimpleHolding: unlocked holding with flat Decimal amount. -- LockedSimpleHolding: locked holding with admin-only lock holder and ext