feat: pass the future imageData object to the view callback #586

[M393]

This allows setting an initial rotation before an image is displayed.
Resolves #586

new Viewer(dummyDiv, {
  // ...
  view: function (event) {
    event.detail.imageData.rotate = 90;
  },

Summary

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Other information:

[fengyuanchen]

In order to keep this library simple, I think it is unnecessary to add this feature.