Support for shadow dom locators and unit tests

[saurav-sandhuQ2]

Description

This PR adds first-class Shadow DOM locator support to Boa.Constrictor.Selenium by introducing ShadowLocator, a new IWebLocator implementation for elements rendered inside an open shadow root.

It also adds unit coverage for:

• shadow locator resolution
• constructor validation
• equality and hash behavior
• compatibility with existing Screenplay interaction equality semantics

Testing

Tested all the Unit Tests after this change and added 14 ShadowLocatorTest and they are also passing

Checklist

• I agree to follow Boa Constrictor's Code of Conduct.
• I read Boa Constrictor's Contributing Code guide.
• I successfully built the .NET solution with no errors or new warnings.
• I successfully ran both the unit tests and the example tests.
• I updated the appropriate changelogs with concise descriptions of these changes.
• I added documentation for these changes (if appropriate).

[pl-shernandez]

@q2ebanking/boaconstrictorcodereviewers This has been used internally and works very well so feel it should be promoted to the larger project

[Swatkins18]

Overall, looks good. One small thing, but I won't hold up the review for it.

[saurav-sandhuQ2]

Updated test run after latest commit

[Swatkins18]

Thank you for your contribution! 🕶️