[browser] Allow JS modules to be injected as pre-loaded assets

[pavelsavara]

• new asset.moduleExports field which could be pre-populated with ES6 exports of runtime modules
• demo in browser-minimal-config\main.js
• allow promise in asset.buffer

To address user feedback
Fixes #89510

[ghost]

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Issue Details

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• new asset.moduleExports field which could be pre-populated with ES6 exports of runtime modules
• demo in browser-minimal-config\main.js
• allow promise in asset.buffer

To address user feedback
Fixes #89510

Author:	pavelsavara
Assignees:	pavelsavara
Labels:	arch-wasm, area-System.Runtime.InteropServices.JavaScript, os-browser
Milestone:	8.0.0

[pavelsavara]

cc @elringus

[elringus]

This should work. Thank you!

[pavelsavara]

@elringus you could take the sample and webpack/rollup it. You could also possibly import json from "./_framework/blazor.boot.json" we generate from that main.js via some webpack json plugin.