[🚀 Feature]: [dotnet] Align solution/project with namespace

[nvborisenko]

Description

This is a continuation of #15791 where we raised a topic for confusing project naming.

Seems we can easily do:

• WebDriver.NET.sln -> Selenium.WebDriver.sln
• WebDriver.csproj -> Selenium.WebDriver.csproj

Renaming assembly/namespace is out of scope due to big breaking change.

UPD: The same for tests and support.

Have you considered any alternatives or workarounds?

No response

Does this apply to specific language bindings?

C#/.NET

What part(s) of Selenium does this relate to?

No response

[selenium-ci]

@nvborisenko, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide