Add support for COMMAND LIST

[chayim]

No description provided.

[dogukanteber]

Hello @chayim. I would like to work on this issue. However, I have a question. How can I test this command? Since it returns all the commands I thought maybe I can get the number of commands and compare them. For instance, currently, I get 363 different commands. Assume I do this operation len("command list") == 363 and in the next version there is another command added. So, the command number is up to 364 and the test fails.

I could not think of a way to test this. Can you give me any advice?

[chayim]

@dogukanteber I think the right answer is to check that we receive a number of commands that's positive and high - as opposed to a specific number. The reason: redis will constantly change, but we'll keep trying to support as many versions as possible!

Ultimately we're trying to test each collection of possibilities. I think this means you need one function that that makes repeated calls and uses r (the stock connection) and another that uses the redismod client. Does that make sense?

Here's the direct link to the new command.
CC: @dvora-h for visibility.