feat: add websocket client

[rukmini-basu-da]

1. Adds websocket streaming support in the wallet-sdk by enabling subscriptions to ledger events
2. Adds websocket-client in the core-ledger-client (handles onOpen, onMessage, onError, and onClose) and implements the async generator pattern for streaming updates
3. Small refactor of the ledger-api-utils in the core-ledger-client so the TransactionFilterSetup and EventFilterSetup support templateIds or interfaceIds

related to #579

in subsequent prs, i'll add the subscribeToHoldings in the TokenStandardController and the commands endpoint