This commit adds the ability to set a `nonce` value on the runtime platform object. This also introduces the consumption of this value and setting of the `nonce` attribute for generated `style` tags in `dist-custom-elements`.

This commit adds the `setNonce` definition to the generated output for the `dist` output target. This also sets the `nonce` attribute on the style tag responsible for invisible pre-hydration styles.

This commit adds some comments to the internal and generated helper function code for apply nonce attributes.

CSP nonces aren't supported by IE so there is no reason to add support in the polyfills

…ow (#3955)

* feat(runtime): updates nonce fallback to use meta tag instead of window

This commit updates our CSP nonce support logic to allow implementers to leverage a meta tag in the DOM head for setting nonce values during the Stencil runtime rather than pulling the value off of the global window object

* fix(): PR feedback

* feat(utils): update return type fallback to `undefined` only