middleware: add support for request rate limiting

[zhqqqy]

Component

Middleware

Middleware

https://github.com/zhqqqy/flamego-limit

Is your feature request related to a problem? Please describe

Web frameworks generally need the function of current limiting.

Describe the solution you'd like

I implemented a simple current limiting middleware based on the sliding window algorithm, which can be enabled in the specified router, and the current limiting key can be customized.

Describe alternatives you've considered

It may also be possible to implement current limiting algorithms such as token buckets based on this

Additional context

No response

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