[rust] Include --driver flag to Selenium Manager

[bonigarcia]

Description

This PR includes a new argument to Selenium Manager called --driver, which is equivalent to --browser (i.e., it allows to select the driver to be managed), but using the driver name (i.e., chromedriver, geckodriver, or msedgedriver) instead of the browser name (chrome, firefox, edge).

Motivation and Context

This is part of the development of Selenium Manager M1, to ease the integration with the Selenium bindings (e.g., in the DriverService class of the Java bindings, we have the driver name instead the browser name).

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[titusfortner]

Yes! this would simplify the code I'm writing quite a bit
Depending on where the project goes we might want to do more with the errors, but at the point we're using it within the bindings, I think this is good.