feat: add pool config for redis

[rfyiamcool]

Description

add poolsize config for redis. the default pool size of the go-redis is small, when many concurrent request to redis, the size of the connection pool affects performance. if the redis pool is full, then all conn in pool is busy, we need to wait a while.

I think we customize the size according to the requirements.

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [x] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

Further comments

[mga-chka]

please, check the failing tests

[mga-chka]

fyi, there are still some issues with the tests

[rfyiamcool]

fyi, there are still some issues with the tests

done, have fixed wrong unit-test.

[mga-chka]

@rfyiamcool fyi I've released a new version of chproxy