Function cachePublicSigningKeys

cachePublicSigningKeys(
    builders: RascalConfigBuilder[],
    keyServiceBaseUrl: string,
    getTokenCallback: GetEventSigningTokenFunc,
    logger?: Logger,
): Promise<PublicSigningKey[]>
Retrieves and caches a list of public keys for services which events the current service is expecting to receive.
Parameters
- builders: RascalConfigBuilder[]
  Used to determine which events the service is expecting to receive. Passing a list of all builders used by setupMessagingBroker is recommended.
- keyServiceBaseUrl: string
  Base URL of Mosaic Key Service
- getTokenCallback: GetEventSigningTokenFunc
  Function to retrieve authorization token result to make a request to the Key Service
- Optionallogger: Logger
  Optional instance of the Mosaic Logger. If not provided - new instance will be created and used by the function itself.
Returns Promise<PublicSigningKey[]>