[release/7.0-preview6] Backport custom HTML elements rendering Blazor components #42383
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Custom HTML elements rendering Blazor components
This PR productizes the custom elements support package. Backport of #42314
Description
This package provides a simple mechanism for using Blazor components as custom elements. This means you can easily render Blazor components dynamically from other SPA frameworks, such as Angular or React.
Fixes #38447
Customer Impact
This package brings value to the scenario where Blazor components are gradually introduced into existing projects written in other SPA frameworks. Rather than having to manually manage the state and lifecycle of Blazor root components using JavaScript APIs, it can now be done in a more intuitive fashion using custom HTML elements. By making this package official and built with the rest of the repository, customers can trust that it will be stable and up to date with the latest version of Blazor.
Regression?
Risk
These changes do not touch the core framework. The new code remains almost unchanged from the existing support package, so it's unlikely we're introducing new bugs.
Verification
Packaging changes reviewed?