perf(port): cache NPC goal

[End3r991]

Purpose of change

One of the PR ported for #3073.

Describe the solution

Describe alternatives you've considered

Testing

Additional context

Source PR: Performance: Cache NPC goal, by @dseguin: CleverRaven/Cataclysm-DDA#54312

Checklist

[chaosvolt]

Before:

After:

It compiles and tests past, variation is really too small to say what it's doing. Might need to spawn a fuckload of dynamic NPCs instead I assume, instead of testing refugee center? I dunno.

[scarf005]

commits are missing co-authors despite being ported from DDA. could we attribute the original authors with this?

https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-with-multiple-authors

[chaosvolt]

Worth a try yeah. Last time I checked their branch out and amended last commit, and it instead created a new commit with the crediting added...

[scarf005]

(left: before, right: after)

command used: perf record -e 'cpu-cycles:u' -ag -- sleep 10

i guess the performance got improved?