Add method: `driver.uc_switch_to_frame(frame)`

[mdmintz]

Add method: driver.uc_switch_to_frame(frame)

(Where frame can be a WebElement OR a selector)

This method is mostly the same as a regular call to switch into an iframe, except that it also includes a driver.reconnect(0.15) action to make it less likely that Selenium will get detected.

On the same release that this gets added in, the following tests will also get updated:

• SeleniumBase/examples/raw_turnstile.py
• SeleniumBase/examples/raw_form_turnstile.py

[mdmintz]

This was resolved in 4.21.2 - https://github.com/seleniumbase/SeleniumBase/releases/tag/v4.21.2