Migrate NGL viewer to npm package

[guerler]

This PR replaces the Galaxy dependent backbone-based charts-ngl plugin with a separate npm package using the Vue3-based charts package.

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[guerler]

Thank you @dannon for helping with this project. This looks gtm +1.

[bgruening]

This works for me flawlessly! Its always cool to see proteins spinning :)

[dannon]

I think there are a few things we want to adjust with the published version of the chart, but this is a good step forward for the ngl viewer specifically in any event using the new publishing/installation mechanisms -- going to go ahead and merge this iteration in.

[github-actions]

This PR was merged without a "kind/" label, please correct.