🔨 Make zone:queryEntitiesByName() fast

[zach2good]

• [x] I have paid attention to this example and will edit again if need be to not break the formatting, or I will be ignored
• [x] I have searched existing issues to see if the issue has already been opened, and I have checked the commit log to see if the issue has been resolved since my server was last updated
• [x] I have read and understood the Contributing Guide

Describe the feature

We're currently getting a lot of use and safety out of zone:queryEntitiesByName() but the current implementation is $O(n)$. We need to bring this down to at worst $O(log n)$, but more likely $O(1)$.

We'll probably want to populate a std::unordered_map<std::string, std::vector<CLuaEntity>> at startup, and use that for our lookups.

This however won't work for dynamic entities, so we'd also need a way to force the linear search by name.