fix(v2.1.9): split subscription requests into batches of 20

[tiagosiebler]

Summary

Fixes error seen when attempting to subscribe to ±90 topics. Requests need to be split into batches of 20 per request.

import {
  DefaultLogger,
  LogParams,
  RestClient,
  WebsocketClient,
} from 'bitmart-api';

const restClient = new RestClient();

const customLogger: typeof DefaultLogger = {
  trace: (...params: LogParams): void => {
    console.log('silly', ...params);
  },
  info: (...params: LogParams): void => {
    console.info(params);
  },
  error: (...params: LogParams): void => {
    console.error(params);
  },
};

const client = new WebsocketClient(undefined, customLogger);

client.on('open', (data) => {
  console.log('connected ', data?.wsKey);
});

client.on('response', (data) => {
  console.info('response: ', data);
});

const tickers = await restClient.getSpotTickersV3();
const arrSpot = tickers.data.map((i) => `spot/depth20:${i[0]}`);

client.subscribe(arrSpot.slice(0, 90), 'spot');

Additional Information