DEV: Pass kwargs to the redis gem when calling methods/commands that we don't wrap (#14530)

This commit fixes the `eval` and `evalsha` commands/methods and any other methods that don't have a wrapper in `DiscourseRedis` and expect keyword arguments. I noticed this problem in Logster when I was trying to fetch some log messages in JSON format using the rails console and saw the messages were missing the `env` field. Logster uses the `eval` command to fetch messages `env`s:

dc351fd00f/lib/logster/redis_store.rb (L250-L253)

and that code was not fetching anything because `DiscourseRedis` didn't pass the `keys` keyword arg to the redis gem.

lib/discourse_redis.rb

@@ -39,7 +39,7 @@ class DiscourseRedis
   # prefix the key with the namespace
   def method_missing(meth, *args, **kwargs, &block)
     if @redis.respond_to?(meth)
-      DiscourseRedis.ignore_readonly { @redis.public_send(meth, *args, &block) }
+      DiscourseRedis.ignore_readonly { @redis.public_send(meth, *args, **kwargs, &block) }
     else
       super
     end