Add option to change update rate for NPCs

[alexey-va]

I confirm that I have ...

• [X] ...tried the latest Development Build to make sure my feature doesn't exist already.
• [X] ...checked the Wiki for any possible information about my feature.
• [X] ...checked other existing issues for my feature request.

Description

Currently Citizens updates some stuff every tick (e.g. npc name). It can take a noticable part of server's tps while sometimes there is no need for that. I have 40 npcs with static names and due to updates taking place every tick Citizens is by far the most heavy plugin on my server.

Code Example

No response

[emmanuelvlad]

I have the same issue, static npcs without the need to be updated take a lot of server performance. I wish there would be a response to this issue or #2872

[galacticwarrior9]

In case empirical evidence of a performance problem is needed:

spark report is here.

These are from the 6 NPCs we have on our server, which use the hologram trait:

[matipoirierg]

can confirm this performance issue

[alexey-va]

Dear devs, pls help. This will increase performance for many servers

[fullwall]

I have just pushed a micro optimisation for this issue.

[fullwall]

Going to close this for now, if required in a different context open another issue.