feat(react): add skipPackageJson flag

[Coly010]

Current Behavior

Adding a new library may always update package.json when it is unnecessary or when it is unwanted behaviour (if the developer has specific versions of packages for a reason).

Expected Behavior

Add the skipPackageJson flag that to the library generator (and subsequent generators that require it) to allow the developer to specifically state if they want the dependencies modified.
This follows the pattern seen in other @nrwl/* packages.

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✅ Successfully ran 12 targets

• nx affected --target=e2e --base=3c65b02c1b6fd705fd3ec70d9a8e1a4765ddd65a --head=5880acf676464dc6304e0134464b76ac6dabca28 --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox,e2e-make-angular-cli-faster --parallel=1
• nx affected --target=build --base=3c65b02c1b6fd705fd3ec70d9a8e1a4765ddd65a --head=5880acf676464dc6304e0134464b76ac6dabca28 --parallel=3
• nx affected --target=test --base=3c65b02c1b6fd705fd3ec70d9a8e1a4765ddd65a --head=5880acf676464dc6304e0134464b76ac6dabca28 --parallel=1
• nx-cloud record -- yarn depcheck
• nx affected --target=lint --base=3c65b02c1b6fd705fd3ec70d9a8e1a4765ddd65a --head=5880acf676464dc6304e0134464b76ac6dabca28 --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=3c65b02c1b6fd705fd3ec70d9a8e1a4765ddd65a --head=5880acf676464dc6304e0134464b76ac6dabca28
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn documentation
• nx build typedoc-theme

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