Add RenderContext in onRenderSuccess

[HJZzzzz]

Hi! Thanks for this amazing library!

This PR is just proposing a small addon regarding a issue i faced when building my own pdf viewer on top of react-pdf.

In my case, i need to know the specs that <Page/> element renders with, so i can tell whether the rendered version is the version i want.

Context: i faced the flickering issue when toggling specs like rotate, width, height.
To fix this, I added sth on top by leveraging on css transform that applied on the 'prev page', to shape it look like the page that about being rendered. (Getting inspirations from here #418)

However, when i keep toggling the specs of the page, i realized that the onRenderSuccess for the outdated specs might still be called.
ie: i quickly toggle it like: {rotate:90, width:100} -> {rotate: 180, width: 200} -> {rotate: 270, width: 200}
the renderSuccess callback for {rotate: 180, width: 200} might be triggered, even though the specs are already changed to {rotate: 270, width: 200}.

Thus, adding the renderContext param in the params will help me to know whether the onRenderSuccess is for rendering the correct specs.

[HJZzzzz]

@wojtekmaj Hi, just fixed the test in my local~ can trigger the pipeline and check again~

[HJZzzzz]

hmmm checked the pipeline and have no idea why it failed.
try the test, build and tsc in my local. all look ok

[wojtekmaj]

Yeah this ain't your fault. Something went wrong like 3 commits ago.

[HJZzzzz]

I see, then are you ok with merging this pr? maybe we can skip the pipeline?

[HJZzzzz]

btw, i realized that the /src directory is not excluded in the built package. Is this intended?