add rate limit

[peterdudfield]

Pull Request

Description

Add a rate limit of 3600 per hour, or 1 a second on each route, for each IP address.
Ive used slowapi, could have use fastapi-limiter but it needed a redis query

#136

How Has This Been Tested?

• CI tests
• run locally and check limit kicks in
• Yes

Checklist:

• My code follows OCF's coding style guidelines
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked my code and corrected any misspellings

[peterdudfield]

Gona push this through, but @devsjc im happy if you have any comments