Add redis rate limiter

[longquan0104]

What does this PR do?

The rate limiter middleware currently is not used with Redis. From my very narrow knowledge, other systems usually use Redis for rate-limiting features. So I tried to add this. The config for the Redis may be referenced here

Motivation

More

• Added/updated tests
• Added/updated documentation

Additional Notes

#6042

[jspdown]

Thanks for opening this PR 😃

As you can see, your PR has been marked with the status/1-needs-design-review label. It means that we are actively reviewing
your work and the scope of the change is considered significant enough to first check how it will fit into Traefik
(e.g. configuration, UX, architecture, ...)

[jspdown]

From a UX point of view, I'm worried about the GCRA algorithm used in go-redis/redis-rate.
We are currently relying on x/time/rate which uses the Token Bucket algorithm.
This is problem since you are configuring both in-memory and redis-based rate limiters from the same configuration struct. So, depending on whether you provide a Redis config or not, you will get a different result and options will have different meaning.

If we don't want to confuse people, which is already a subject difficult to explain and document, I think we should try to
use the same algorithm in both.

[rtribotte]

Hello @longquan0104,

Thank you for your for this contribution.

Regrettably, due to our current focus on v2.11 and the imminent release of v3.0, the review of your pull request will experience a delay.

Additionally, as mentioned in previous comments, there are outstanding questions related to the proposed changes. It would have been beneficial to address these in a discussion on a proposal issue before the pull request, ensuring clarity and coherence.

We appreciate your understanding and patience during this time. Your contribution is valued, and we look forward to working together to address the questions and integrate your feature into an upcoming release.

[longquan0104]

Sorry for disappearing for a month. I came back and made some updates for this.

[longquan0104]

Hi @jspdown , I've just made an update, please help me to review it. Thank you ❤️

[longquan0104]

Please let me know if any updates need to be done @jspdown.

[longquan0104]

Hello @jspdown , just make some updates. Please let me know if there is any change I should make. Thank you

[ldez]

You don't have to rebase or "merge with master" your PR unless you have conflicts.

[longquan0104]

Oops. Sorry for this mess.