`validate_document_id` function trims the id, but maybe shouldn't

[loiclec]

See: https://github.com/meilisearch/milli/pull/561#discussion_r925394083

So a document such as:

{
    "id" : "  hello  "
}

will have the id:

"hello"

but according to the Meilisearch documentation, spaces are not allowed in document ids. So one could argue that the document should not be accepted in the first place.

[irevoire]

And thus the documents

{ "id": " hello", ... }
{ "id": "hello ", ... }

Will be merged together, which is clearly a bug

[curquiza]

I've created https://github.com/meilisearch/meilisearch/issues/2640 to track it for the sprint. Feel free to close this issue in favor of this one if you prefer

[curquiza]

Closed in favor of https://github.com/meilisearch/meilisearch/issues/2640