Missing addForFacetValue in the SearchClient makes im not compatible for typescript users

[bidoubiwa]

Description

see #48
Thanks a lot to @haoyun for raising this

When using typescript a searchClient has to response to the search client interface

export type SearchClient = {
  search: DefaultSearchClient['search'];
  searchForFacetValues: DefaultSearchClient['searchForFacetValues'];
  addAlgoliaAgent?: DefaultSearchClient['addAlgoliaAgent'];
  initIndex?: (
    indexName: string
  ) => SearchIndex extends { findAnswers: any }
    ? Partial<Pick<SearchIndex, 'findAnswers'>>
    : SearchIndex;
};

Accessible here: https://github.com/algolia/instantsearch.js/blob/16cc34155d8af25893db3e521b4a1da26ce591e4/src/types/algoliasearch.ts#L33-L42

Until recently it was an optional method.

Expected behavior
The method should be present to make instantMeiliSearch usable with typescript

Current behavior
As the method is missing it does not work on typescript projects

Environment (please complete the following information):

• instantsearch.js version: [e.g. v4.23.0]

[haoyun]

I am using "instantsearch.js": "4.25.1-experimental-typescript.0", . Currently I forcibly cast instantMeiliSearch as SearchClient

const searchClient = instantMeiliSearch(hostUrl, apiKey, options) as any as SearchClient

Typescript support in instantsearch.js is still an experimental feature. But their recent releases are all about the TS support.

[bidoubiwa]

That is very good to know @haoyun. Would you like to implement it? Otherwise I will do it but it can take some time as I'm leaving tonight for two weeks