🧹 Create a `FileOptions.CacheRoot` and only Cache Files if Enabled

[mathew-odwyer]

Checklist

• I have not removed the 🧹 emoji from the title.
• I have confirmed that this task is not already tracked under another tech debt or refactor issue.
• This does not represent a user-facing feature request or bug report, but an internal improvement.
• For maintainers: I have updated the projects and milestones if needed.

Description

We should likely create an option in appsettings.json that will only cache files (see here) if enabled. Disabling this for local testing when we're not editing maps is fine; but it should likely be enabled for demo or production environments.

Impact

It's nice to disable caching when developing but leaving this on in the demo or production environment is likely a bad idea in terms of performance. So, performance is a bonus.