feat: ai rate limiting redis support

[beardnick]

Description

Which issue(s) this PR fixes:

Fixes #12482

Notice

• I have updated the limit-count-redis.lua and limit-count-redis-cluster.lua files to ensure they now support rate-limiting during the log phase.
• I referred to the limit-conn-redis.lua file as a guide while implementing rate-limiting in the log phase.
• To ensure a clean testing environment, I added the require("lib.test_redis").flush_all() function to every Redis rate-limiting test case. Without this addition, the tests could fail unpredictably.
• I have adjusted the expected results in limit-req-redis.t and limit-req-redis-cluster.t test cases. After thorough verification, the correct behavior is [200, 403, 403, 403]. Previously, the results appeared as [403, 403, 403, 403] due to Redis not being properly cleaned beforehand.

Checklist

• [x] I have explained the need for this PR and the problem it solves
• [x] I have explained the changes or the new features added to this PR
• [x] I have added tests corresponding to this change
• [x] I have updated the documentation to reflect this change
• [x] I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[beardnick]

@Baoyuantop PTAL

[membphis]

@beardnick many thx for your contribution, some CI tests are failed, you can fix them

[Baoyuantop]

Hi @beardnick, please check these comments.