excaliburjs / Excalibur / 8880025742

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feat: provide development build for bundlers, warn on unadded entity (#3032)

This adds a "development" build of Excalibur that [bundlers can use](https://webpack.js.org/guides/package-exports/#providing-devtools-or-production-optimizations). It allows us to include code that can be used to help the user during development but still keep it out of production builds as to not affect performance / size. 

This requires removing the `module` field in package.json in favour of `exports`, which is OK (`exports` essentially supersedes `module`). **There is potential for breaking change** here, as any nested imports e.g. `'excalibur/dist/abc'` would now need to be added to this exports map. But I don't believe there was ever a reason to do that, since everything is exported from the excalibur.js file. (Types are not affected)

I've tested this in a Vite project and it works, haven't tested it with Webpack yet.

## Changes:

- create development builds of excalibur that bundlers can use in dev mode
- show warning in development when Entity hasn't been added to a scene after a few seconds

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