Add mvnpm support in webjar-locator

[phillip-kruger]

This PR adds support for mvnpm in the webjar-locator extension.
As discussed, we probably need to rename the extension.

In this PR:

• mvnpm libraries can now also be referenced directly without needing the version in the url, example: <script src="_static/bootstrap/dist/js/bootstrap.min.js"></script> in the html.
• mvnpm libraries can also now be used with an importmap. The importmap can be added to the html: <script src="/_importmap/generated_importmap.js"></script>
• With the importmap, any library can then be use with imports : <script type="module">import '@vaadin/date-picker';</script>
• User can also map their own folder/files to be included with the importmap. This can be done with config. Example: quarkus.web-jar-locator.import-mappings.app/ = /app/ . Then it can be use example: <script type="module">import 'app/demo-app.js';</script>
• Because the user might only use importmaps and only mvnpm, there is also now an option to turn off the version reroute, as this will not be needed when using importmaps
  Once this PR is merged and the rename has happened, we still need to update the documentation to include above.

[quarkus-bot]

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It should be safe to merge provided you have a look at the other checks in the summary.

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[ia3andy]

Thanks @phillip-kruger :)