[FEATURE] Create package for Web Host Checker

[japtar10101]

Is your feature request related to a problem? Please describe.

Yup, Web Host Checker.

Describe the solution you'd like

Split the parts that verifies the WebGL build's web host into a new package.

Tasklist

• [ ] Look into what files can be moved into its own Unity package.
• [ ] Verify WebHostChecker does not rely on Singleton.
  • [ ] If it does, make it not rely on it.
• [ ] Move the files.
• [ ] Shift debugging functions to their own script so Unity doesn't compile them when making a build that doesn't use said script.
• [ ] If the script loads-in the DomainList, look into unloading later.
• [ ] Create a sample project with the debugging enabled.
• [ ] Create a sample project with actual web-host checking setup properly.

Additional context

Part of the effort to create the Web Host Checker package effort.

[japtar10101]

Closing as moving this issue to a new project