Allow to specify extra attribute in getScriptTags

[nchaulet]

Summary

When you using loadable components server side
I want to be able to provide extra attributes to generated script tags, especially a nonce attribute used for Content-Security-Policy.

Test plan

I added a small test on how you can use this new extraProps.

[gregberge]

Hello @nchaulet, thanks for your PR. I think it is a good idea! But I would like to have it on all methods available. Having it on getScriptTags and not on getScriptElements is pretty confusing. Same on style methods. Could you generalize it?

[nchaulet]

Sure I am going to add it

[gregberge]

Thanks, one last thing, can you update the documentation? Also should we add it to getStyleXXX methods?

[nchaulet]

Yes I am going to update the doc, and add it to getStyle*

[gregberge]

Thanks!