add management server rate limiting

[Hammer1279]

Currently, if the management interface is exposed through any means, its possible to brute force the management credidentials.
This can be mitigated with the rate limit from:

• Rate limits and anti DDoS/bruteforce #2.

As #2 will still need some time, it makes sense to implement a implementation directly in the management server that can be configured directly through the config.

Tracking issue for:

• https://github.com/Hammer1279/node-proxy-manager/security/code-scanning/1