[dotnet] Use vendor-specific method names for additional Chromium options.

[bwalderman]

Description

Renames ChromiumOptions.AddAdditionalChromeOption to the more vendor-neutral ChromiumOptions.AddAdditionalChromiumOption. Make this method protected and add vendor-specific versions of this method to the derived classes ChromeOptions and EdgeOptions.

Motivation and Context

This avoids potential confusion with customers using EdgeOptions having to use the Chrome-branded AddAdditionalChromeOption for capabilities that may in fact be Edge-specific (e.g. webview2 or device portal options). The existing AddAdditionalChromeOption is preserved on ChromeOptions to avoid breaking ChromeOptions users that call this method.

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.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[jimevans]

This is a much more elegant API solution. Thank you for the contribution!