feat: add crossOriginLoading option support

[chikara-chan]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

#312

Reference code. We could reuse Webpack output options.

Breaking Changes

Additional Info

[jsf-clabot]

All committers have signed the CLA.

[ooflorent]

I like the idea on reusing crossOriginLoading option but I don't like the way it is integrated in the runtime code.

In my opinion it would be better to do it like webpack.

• if crossOriginLoading is truthy, adds the crossOrigin attribute
• remove the if guard

In webpack, the runtime generation is different but you can look at the implementation here: https://github.com/webpack/webpack/blob/614a6fc0109a702ee64ca0b0982a0d638b1b6ca1/lib/web/JsonpMainTemplate.runtime.js#L19

[sokra]

@ooflorent In webpack it's similar. Also guarded by an if. It makes sure that cookies are send when requesting same-origin.

https://github.com/webpack/webpack/blob/614a6fc0109a702ee64ca0b0982a0d638b1b6ca1/lib/web/JsonpMainTemplatePlugin.js#L163-L171

see also webpack/webpack#7017

[alexander-akait]

Good work, can we add test? Maybe manual

[alexander-akait]

Please accept CLA

[chikara-chan]

@evilebottnawi done

[alexander-akait]

@chikara-chan something wrong, looks you have difference emails in commits and in CLA

[chikara-chan]

@evilebottnawi Sign the CLA with the same email in success!