cleanup(angular): add utilities for shared builder logic

[Coly010]

Cleanup shared logic for builders into utilities for:

• buildable libs
• custom webpack config merges

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✅ Successfully ran 12 targets

• nx affected --target=e2e --base=983afffb314af0732021fd125e511576e7191bf5 --head=1f75eb30ca0064f699f187a9ed386ad33a7b4813 --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox,e2e-make-angular-cli-faster --parallel=1
• nx affected --target=test --base=983afffb314af0732021fd125e511576e7191bf5 --head=1f75eb30ca0064f699f187a9ed386ad33a7b4813 --parallel=1
• nx affected --target=build --base=983afffb314af0732021fd125e511576e7191bf5 --head=1f75eb30ca0064f699f187a9ed386ad33a7b4813 --parallel=3
• nx-cloud record -- yarn depcheck
• nx affected --target=lint --base=983afffb314af0732021fd125e511576e7191bf5 --head=1f75eb30ca0064f699f187a9ed386ad33a7b4813 --parallel=3
• nx-cloud record -- yarn nx workspace-lint
• nx-cloud record -- yarn check-lock-files
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn nx format:check --base=983afffb314af0732021fd125e511576e7191bf5 --head=1f75eb30ca0064f699f187a9ed386ad33a7b4813
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn documentation
• nx build typedoc-theme

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Name	Status	Preview	Updated
nx-dev	⬜️ Ignored (Inspect)		Nov 2, 2022 at 10:23AM (UTC)

[leosvelperez]

LGTM! 🎉

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.