Improve redis integration patching

[TonyCTHsu]

What does this PR do?

Until redis 4, all instrumentation happened in one gem: redis. Since redis 5, instrumentation happens in a separate gem: redis-client. Because redis 4 does not depend on redis-client, it's possible for both gems to be installed at the same time.

For example, if sidekiq 7 and redis 4 are installed: both redis and redis-client will be installed.

This implementation improves the patching condition to apply to whenever it is possible.

PS. The minimun redis-client supported would be 0.11.0, where Config#custom is implemented.