Feature request: Add ParseFailoverURL

[khasanovbi]

Please add support for ParseFailoverURL for FailoverOptions, analogue of ParseURL, ParseClusterURL
Also maybe some constructor that create redis.UniversalClient from url.

[ndyakov]

Hello @khasanovbi , I am marking this as good first issue and if someone would like to work on it I will provide assistance.

[deidaraiorek]

@ndyakov hi i would love to work on this

[ndyakov]

@deidaraiorek feel free to take a shot at it. You can start from the https://github.com/redis/go-redis/blob/master/CONTRIBUTING.md and if you find anything missing from the documentation feel free to ask me questions (you can find me on the discord https://discord.gg/U3TkxJfJRk .