feat(runtime-core): support hydration of all custom element properties #8038
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Resolves #7203 by checking for the presence of a custom element in the custom element registry and allowing that to be hydrated with vue properties.
Ideally, I'd use the isCustomElement compiler option - however, that is not available at runtime. This is the next best thing - however, it could potentially hydrate more components than the user intended if they have not specified all of their custom elements in the isCustomElement function.
This is required for hydration to function correctly in prashantpalikhe/nuxt-ssr-lit#34
This PR superceedes #7300 & #8035 as those got out of sync with main