Iterate on type safety for `zadd`


Issue #60 called for improving the type safety of the options available for the `zadd` command, and MR !70 made some great headway, but attempted to cram too much into a single enum.


- Break the `RedisSortedSetAddOption.returnChangedCount` value into an additional boolean param


Using `zadd` should now be more straight forward, while being type safe.
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