Add a custom user-agent for Node users.

[brunoocasali]

The idea is to send a new Meilisearch Node (v0.0.0) alongside the current user agents when the user requests on the backend side.

I think there are valuable insights if we could differentiate those metrics.

[suvekshyabhandari356]

Hi @brunoocasali can you let me know if this is still be done?

[brunoocasali]

Yes, go ahead as far as I remember we still have the same user agent for both!

[flevi29]

#1739 makes it so there is only one universal client.