Merge #3406

3406: Master Key: Implements errors and warnings from the specification r=irevoire a=dureuill

<sub>Now in technicolor</sub>

# Pull Request

## What does this PR do?
- Uses `atty` and `termcolor` as dependency
- Use these dependencies to print colored background for warning messages
- Update messages to match https://github.com/meilisearch/specifications/pull/209

## PR checklist
Please check if your PR fulfills the following requirements:
- [ ] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [ ] Have you read the contributing guidelines?
- [ ] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: Louis Dureuil <louis@meilisearch.com>

Cargo.lock

@@ -2285,6 +2285,7 @@ dependencies = [
  "assert-json-diff",
  "async-stream",
  "async-trait",
+ "atty",
  "brotli",
  "bstr 1.1.0",
  "byte-unit",
@@ -2344,6 +2345,7 @@ dependencies = [
  "tar",
  "temp-env",
  "tempfile",
+ "termcolor",
  "thiserror",
  "time",
  "tokio",