Fix type hinting of zrange and zrangestore

[aveao]

Pull Request check-list

• Do tests and lints pass with this change?
  • locally tested, yes
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
  • Yes
• Is the new or changed code fully tested?
  • Runs fine, and this is only typing changes
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
  • Unsure if I see any related documentation, the docstring was already correct.
• Is there an example added to the examples folder (if applicable)?
  • Not applicable

Description of change

Fixes #252

start/end are type hinted as int only, whereas when bylex (or byscore) is set to True, the value is expected to be prepended with [ or (, as stated both in the function's docstring and redis docs.

This can only be done if start/end are passed as a string or as bytes.

Equivalent to redis/redis-py#3872

[mkmkme]

Hey! Thanks for your PR. I'm currently working on the bigger change related to typing system in the repo. It's quite a mess at this point. My changes will make your changes obsolete. We can of course merge this one, but there won't be a lot of sense to keep it soon