[v1.9] Accept the `frequency` value for the `matchingStrategy` search parameter

[curquiza]

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Following this central issue

This is related to a newly introduced feature in Meilisearch v1.9.0: accept the frequency value for the matchingStrategy search parameter.

Refer to docs for more information.

• [ ] Ensure the library can accept the frequency value for the matchingStrategy search parameter.
• [ ] ⚠️ Add integration tests ⚠️
• [ ] Update the .code-samples.meilisearch.yaml
  • [ ] Add search_parameter_guide_matching_strategy_3 key and “translate” the following curl example by using the newly added methods: https://github.com/meilisearch/documentation/blob/04f26a35771305378ed0a506f4d60ef06d07bd7e/.code-samples.meilisearch.yaml#L927