feat(auth): add support for function for password

[simong]

Builds on https://github.com/redis/ioredis/pull/1985 and fixes the test failures.

PRing mainly to get feedback.

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[PavelPashov]

Hey @simong thank you for creating this PR, I'm going to take a look at it later

[PavelPashov]

run sharded pub sub tests

[uglide]

Testcase	Errors	Failures	Skipped	Total
Root Suite	0	0	0	0
Sharded Pub/Sub E2E	0	0	0	0
Single Subscriber	0	0	0	3
Multiple Subscribers	0	0	0	2

---- Details for maintainers

[simong]

@PavelPashov : Any further feedback you would like me to address?

[PavelPashov]

Hey @simong, we've been evaluating adding an auth flow similar to the approach in node-redis. As part of that evolution, a password function will be redundant. We'll get back to you once we have a better idea of the timeline for this addition. Let's keep the PR open until we know more.