feat(@angular-devkit/build-angular): tailwindcss purge

[vltansky]

closes #20015

setting tailwindConfig.purge.enabled based on buildOptions.optimization.styles.minify.

Would be happy for guidance from @clydin to finish this PR if it goes in the right direction. Or feel free to close PR and implement it yourself :)

[vltansky]

I've added a check to ensure that the config doesn't export a function, so we can set the purge.enabled option.
I think it is fine, as even official Tailwind VSCode extension won't work if config exports a function (see https://github.com/ngneat/tailwind/pull/39)

[vltansky]

I guess this PR is not relevant anymore

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