refactor(@angular/build): add component update middleware to development server #28631
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An additional development server middleware has been added that responds to client
/@ng/component
requests from the Angular framework for hot component template updates. These client requests are made by the framework after being triggered by the development server sending aangular:component-update
WebSocket event. The Angular compiler's new internal_enableHmr
option will emit template replacement and reloading code that uses this new development server update middleware. Within the development server, the component update build result will be used to indicate that an event should be sent to active clients. The build system does not yet generate component update results.