Customizing how Auto mode makes its decision

[SteveSandersonMS]

The initial implementation of the Auto rendermode will be hardcoded to make its choice based on whether the WebAssembly files are already downloaded and cached.

Some developers may want to implement custom rules, e.g.:

• For certain device types or network conditions, always use Server or WebAssembly (even if the user has to wait for it to download)
• Perhaps others?

There could be a JS-side callback to allow arbitrary JS code to make the decision.

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We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
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