[GH-211] Try parsing the response using JSON.parse after performing Typesense request

[nguyenkhavi]

Change Summary

As @cungminh2710 already mentioned on this pull request, typesense-js will use the Axios fetch adapter in the case of Edge Runtime like Cloudflare. The Axios fetch adapter returns a string instead of a parsed object in the response body.
I added some lines of code to try parsing the response using JSON.parse after performing Typesense request:

  async _adaptAndPerformTypesenseRequest(instantsearchRequests) {
    const requestAdapter = new SearchRequestAdapter(instantsearchRequests, this.typesenseClient, this.configuration);
    const typesenseResponse = await requestAdapter.request();
    if (typeof typesenseResponse === "string") {
      try {
        return JSON.parse(typesenseResponse);
      } catch (error) {
        return typesenseResponse;
      }
    } else {
      return typesenseResponse;
    }
  }

Close GH-211

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