feat: make script-src: 'unsafe-eval' unnecessary in CSP

[izaera]

This is part of https://liferay.atlassian.net/browse/LPS-178066 and allows YUI to run in servers using a CSP that doesn't include 'unsafe-eval'.

[bryceosterhaus]

the original function seems like a little black magic to me, so your changes seem fine 🤷

[izaera]

the original function seems like a little black magic to me, so your changes seem fine shrug

Apparently it was a typical idiom used by transpilers, bundlers, etc... -> https://stackoverflow.com/questions/29706284/whats-the-purpose-of-new-functionreturn-this-in-immediately-invoked-fun

[dsanz]

Merged! Thx