feat: web accessible scripts

[blake-regalia]

Adds ability to transpile scripts that user includes as web accessible resources. For instance, if a content script needs to inject an inpage script into the webpage at runtime, the user can simply include the path to the inpage script as a web_accessible_resource and the plugin will take care of the rest.

This PR also adds a new plugin option webAccessibleScripts that simply mirrors the inputs to createFilter, allowing user to control which files will match as scripts:

interface ViteWebExtensionOptions {
  webAccessibleScripts?: {
    include?: Pattern;
    exclude?: Pattern;
    options?: {
      resolve?: string | false | null;
    };
  };
}

[blake-regalia]

Closes #30

[samrum]

Thanks for the PR! Could you add some tests for these changes? Should be very similar to test/fixture/index/javascript/manifestV2/webAccessibleResourceHtml.ts and test/fixture/index/javascript/manifestV3/webAccessibleResourceHtml.ts

[blake-regalia]

Added some tests following the pattern for resources.

[blake-regalia]

ping @samrum ?

[blake-regalia]

Ah, I see a missing dev dependency, but on my local machine I'm getting the same test failures about unhandled/*.html -- not sure where that is coming from as I didn't touch those tests.

[samrum]

Couple of things, the test failures related to html are because of the unfiltered web accessible resource input pushes

[samrum]

Also, your tests need to be added to test/fixture/index/javascript/manifestV2/index.ts and test/fixture/index/javascript/manifestV3/index.ts for them to run

[blake-regalia]

@samrum Thank you for the guidance, it was a huge help! I believe that should take care of it.

[blake-regalia]

@samrum I see the merge is blocked since those commits aren't signed, how do you suggest we proceed? Do you want me to open a new PR with a squashed and signed commit?

[blake-regalia]

@samrum okay, I've retroactively signed all commits. I think it's ready to merge :)