Add canvaskit_base_url parameter to flet.app() for custom CanvasKit hosting #2022
Description
The canvasKitBaseUrl specifies the download address for canvaskit.js. From main.dart.js, it can be seen that the default parameters passed in are similar to {renderer: 'canvaskite', useColorEmoji: false}, as there is no canvasKitBaseUrl in it, so the default address is used https://www.gstatic.com/flutter-canvaskit/ Due to network reasons, such as being deployed on an intranet, it may not be possible to load canvaskit.js and canvas.wasm, resulting in the inability to use the flex program properly.
Therefore, if canvaskitBaseUrl can be passed to the app function like useColorEmoji, or directly set to asset_ Dir allows users to set their own settings based on network conditions.
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