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4535: Support Negative Keywords r=ManyTheFish a=Kerollmops This PR fixes #4422 by supporting `-` before any word in the query. The minus symbol `-`, from the ASCII table, is not the only character that can be considered the negative operator. You can see the two other matching characters under the `Based on "-" (U+002D)` section on [this unicode reference website](https://www.compart.com/en/unicode/U+002D). It's important to notice the strange behavior when a query includes and excludes the same word; only the derivative ( synonyms and split) will be kept: - If you input `progamer -progamer`, the engine will still search for `pro gamer`. - If you have the synonym `like = love` and you input `like -like`, it will still search for `love`. ## TODO - [x] Add analytics - [x] Add support to the `-` operator - [x] Make sure to support spaces around `-` well - [x] Support phrase negation - [x] Add tests Co-authored-by: Clément Renault <clement@meilisearch.com>