`MatchingStrategies` type issues

[F. Levi]

I know this might sound like nitpicking, but I am trying to contribute, and this does cause a little issue.
I see that the instantsearch plugin even went so far as to re-implement the native enum into a typescript enum.

meilisearch-js/src/types/types.ts

Lines 57 to 62 in b9f3c6a

 export const MatchingStrategies = { 
   ALL: 'all', 
   LAST: 'last', 
 } 
  
 export type MatchingStrategies = typeof MatchingStrategies[keyof typeof MatchingStrategies] 

Should be re-written to:

export const MatchingStrategies = { 
   ALL: 'all', 
   LAST: 'last', 
 } as const

// OR

export const MatchingStrategies = Object.freeze({ 
   ALL: 'all', 
   LAST: 'last', 
 })
  
 export type MatchingStrategies = typeof MatchingStrategies[keyof typeof MatchingStrategies]

Otherwise MatchingStrategies is just string.

[Clémentine]

Good idea! Feel free to implement it, we are open to review your PR 😄