Hammer import crashes Rollup build (ESM version)

I integrate the Zoom plugin in my code like this:
```js
import zoomPlugin from 'chartjs-plugin-zoom';
```

Then I run a Rollup build:
```
npm run build
```

The build crashes with the following error:


In order to fix the build, I go manually edit [chartjs-plugin-zoom.esm.js](https://www.npmjs.com/package/chartjs-plugin-zoom?activeTab=code) and replace line 7:
```js
import Hammer from 'hammerjs';
```

with
```js
import 'hammerjs';
```

I could not find an official guide how to integrate Hammer ESM package, but [this Stackoverflow answer](https://stackoverflow.com/a/41322757/9812865) seems to have a lot of votes and here I found the solution.

If would be great to fix this in the source code, so this fix doesn't have to be done manually after every install or update of the npm package.

Run npm run build to reproduce the Rollup failure, then trace chartjs-plugin-zoom.esm.js back to the source import and inspect the Rollup build entry point. Done means the ESM package builds successfully with the Hammer integration and no manual edit is needed after installation.

Written by the indexing model from the issue text.