Fix type hinting of zrange and zrangestore

[aveao]

Description of change

Fixes #3871.

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.

Pull Request check-list

Please make sure to review and check all of these items:

• 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

NOTE: these things are not required to open a PR and can be done
afterwards / while the PR is open.

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[petyaslavova]

Hi @aveao, thank you for your contribution. We will review it soon.

[petyaslavova]

LGTM.