Improve type hinting by using overloads

[d-hage]

Proposed changes

Ran into some issues regarding type hinting. To solve this, added some overloading to help with type hinting! This should not be a breaking change.

Types of changes

What types of changes does your code introduce to Appium? Put an x in the boxes that apply

• [x] Bugfix (non-breaking change which fixes an issue), not necessarily a bug though, but more like convenience issue..
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Minor Update (if none of the other choices apply)

Checklist

• [x] I have read the CONTRIBUTING doc
• [x] I have added tests that prove my fix is effective or that my feature works (not needed, 100% pass)
• [x] I have run pre-commit and unit tests and all pass locally with my changes

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...