Define and implement the user XP when searching for phrase query where position are not available.

When position are not available if the user search for a phrase query, we just return an error message explaining that phrase query are not supported for this field.

Still, users who haven't any position may still want a mechanism to feed tantivy with a phrase, and have it tokenized. (just not have position matching)

We need some syntax to do this.

• backticks? text:`elu par cette crapule`
• parenthesis? text:(elu par cette crapule)
• bracket? text:[elu par cette crapule]
• single quotation mark? text:'elu par cette crapule'

I have a preference for parenthesis or single quote.