3334: Add specific error codes `immutable_...` r=irevoire a=loiclec
Add the following error codes:
When an immutable field of API key is sent to the `PATCH /keys` route:
- `ImmutableApiKeyUid`
- `ImmutableApiKeyKey`
- `ImmutableApiKeyActions`
- `ImmutableApiKeyIndexes`
- `ImmutableApiKeyExpiresAt`
- `ImmutableApiKeyCreatedAt`
- `ImmutableApiKeyUpdatedAt`
When an immutable field of Index is sent to the `PATCH /indexes/{uid}` route:
- `ImmutableIndexUid`
- `ImmutableIndexCreatedAt`
- `ImmutableIndexUpdatedAt`
Co-authored-by: Loïc Lecrenier <loic.lecrenier@me.com>
Co-authored-by: Tamo <tamo@meilisearch.com>