filterKeys_(data) {
    const includeKeys = this.config_.includeKeys;

    if (!includeKeys.length) {
      return data;
    }

    return Object.keys(data).reduce((acc, key) => {
      if (includeKeys.includes(key)) {
        acc[key] = data[key];
      }
      return acc;
    }, {});
  }
Filter the CMCD data object to include only the keys specified in the
configuration.

@param {CmcdData} data
@return {CmcdData}
@private