Following this central issue

Explanation of the feature

Add a new capability to update documents based on a function

Usage: https://meilisearch.notion.site/Update-Documents-by-Function-0cff8fea7655436592e7c8a6de932062

TODO

• Add a new method named updateDocumentsByFunction calling the newly added /indexes/:uid/documents/edit. This method accepts an object as parameter
• Add tests

⚠️ Please do 1 PR for all of these changes, and not several.