[HybridWebView] Refactor and convert the HybridWebView.js file into a TypeScript file

[mattleibow]

Description of Change

This PR forms part of the effort to make the JS file injected into the app at runtime like the way Blazor works: #24730. However, this PR does not inject anything at this point, just compiles the TS file to JS as part of the build.

This PR only changes a few things:

• Convert the JS file into TypeScript
• Move the JS file into the Core project structure so it is not just a sample resource but part of the maui source
• Link the output into the sample/test apps

Issues Fixed

Related to #24730
Fixes #27258

[mattleibow]

@MackinnonBuck I hear you are a super TS guru so I was wondering if you had some time to review this refactored code and let me know where I have done off the rails.

[MackinnonBuck]

The TS changes look good to me :) Just a few small comments.

[mattleibow]

Thanks for the review!

[tj-devel709]

Noob question, but why do we have both the HybridWebView.js and the HybridView.ts file? Aren't they essentially the same thing?

[mattleibow]

The .ts file is a "source file" that gets compiled into .js, and then the .js file is used.

I technically should not be including the js file since it is a build artifact, but just like we keep the .aar file in to avoid failing builds where the tooling is not installed. The TypeScript compiler uses nodejs, so if you don't have that the build will fail.

I am also keeping the .js file for reference/download source since we do not ship the file yet. See #24730