chore(@ngtools/webpack): allow JSON files to be cacheable

[manekinekko]

Reason

Static JSON files put in the assets folder are not currently cacheable because they are ignore by the Webpack url-loader.

[filipesilva]

Files and directories in the .angular-cli.json assets array are not meant to be processed through loaders.

I'm not too clear on what's the usecase you're trying to fix here, and what broken. Can you elaborate please? Opening an issue would be better than discussing here as well.

[manekinekko]

Sure. See this related issue #7505

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