Custom logger

[melvynhills]

It would be useful to expose the logger functionality instead of the default console.

Something like:

types.ts

export type InputType = {
  // ...
  enableDebugLogs?: boolean;
  logger?: (message: string) => void;
}

fetch.ts

static init(options: InputType) {
  let config = validateAndNormaliseInputOrThrowError(options);
  
  if (options.enableDebugLogs !== undefined && options.enableDebugLogs) {
      enableLogging(options.logger);
  }

logger.ts

let _logger = console.log;

export function enableLogging(logger?: (message:string) => void) {
    __supertokensWebsiteLogging = true;
  if (logger) {
    _logger = logger
  }
}

export function logDebugMessage(message: string) {
    if (__supertokensWebsiteLogging) {
        _logger(
            `${SUPERTOKENS_DEBUG_NAMESPACE} {t: "${new Date().toISOString()}", message: \"${message}\", supertokens-react-native: "${version}"}`
        );
    }
}