Adding interceptor do ClientOptions

[toshiossada]

When I create a HitsSearcher() I would to be ennabled to give interceptors to custumize my interceptors.

      HitsSearcher(
        applicationID: Constants.applicationId,
        apiKey: Constants.apiKey,
        indexName: Constants.indexName,
        options: const ClientOptions(
          connectTimeout: Duration(seconds: 40),
          interceptors: [MyInterceptor()]
        ),
      ),

This way I could to do my own Cache system

[toshiossada]

I made this change in https://github.com/algolia/algoliasearch-helper-flutter/pull/149