Connection string for all storage

[alswl]

Hi, thanks for developed gokv, this is a awesome project.
I request a feature that using one connection string for all supported storage.

feature request

I'm using https://github.com/jaredwray/keyv before, this is a Node library, and it using Keyv connection string,
example: redis://user:pass@localhost:6379, availabe Keyv storage adapter: redis, mongo, postgres and mysql.

When users using the connections string, they can simple change the storage provider by change the configuration.

implement(maybe)

Provide a sub module named gokv-all, it contains all the storage implementations and register the implementations.
Which implementations used is decide by the connection string.

Thanks.