fix(nextjs): add Next.js config enhancer for supporting css moduels in workspace libs

[jaysoo]

Add a withNx function for next.config.js to use. This function will modify the webpack config to allow workspace libs to use CSS modules.

Current Behavior

CSS modules don't work in workspace libs when importing them into next.js app.

Expected Behavior

CSS modules should work in workspace libs when importing them into next.js app.

Related Issue(s)

Fixes #3803

[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 3c7784b. Click to see the status, the terminal output, and the build insights.

Status	Command	Start Time
	nx build-base next	11/9/2020, 4:21:22 PM
	nx run-many --target=build --all --parallel	11/9/2020, 4:21:20 PM
	nx run-many --target=e2e --projects=e2e-next	11/9/2020, 4:21:57 PM
	nx run-many --target=lint --all --parallel	11/9/2020, 4:22:31 PM
	nx run-many --target=test --all --parallel	11/9/2020, 4:21:31 PM

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[vinverdy]

i think i have an issue related to this, babel-plugin-macros not working on library. I am not familiar with webpack, is there any clue to solve my issue?

i try use some code from next-transpile-modules, but cant find it working.

[github-actions]

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