[v1] Add a standalone Icon component, and some other improvements.

[santiagocezar]

Improves DX by not having to enable the integration and manually include icon packs (on SSG environments at least).

The other improvements include:

• Dropping dependency on @iconify/json: Devs might only need local icons or from specific packages (which can be individually installed with @iconify-json/ic for example). Now using functions from @iconify/utils.
• Collections are stored as an object for faster indexing
• Improved error reporting and added a hint?: string to the Error interface

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[stramel]

@santiagocezar What's the benefit of the StandaloneIcon vs IntegratedIcon? Is there a need to differentiate them?

[stramel]

@santiagocezar I used a lot of it as inspiration for getting the v1 into the shape it is in now. We're going to skip the extra component without using integration right now for the initial release. If there is a demand for using the icon without the integration, we can revisit it in the future! Thanks again for this PR!