ES6 Module support

### Feature Proposal

Rather than a script element and a global, it would be convenient to be able to import Chart as an ES6 module. For example:

`import {Chart} from "https://cdn.jsdelivr.net/npm/chart.js";`

Currently, `import * as chart from "https://cdn.jsdelivr.net/npm/chart.js";` works, but does not provide any functionality (so far as I can tell).

Is this something that would be worth adding?

### Possible Implementation

_No response_