feat(nextjs): add support for experimental appDir

[ndcunningham]

This adds support for --appDir when creating a new nextjs project using nx

npx nx generate @nrwl/next:application my-app --appDir

Should populate your workspace with something similar to this:

apps/my-app
├── app
├── index.d.ts
├── jest.config.ts
├── next-env.d.ts
├── next.config.js
├── project.json
├── public
├── specs
├── tsconfig.json
└── tsconfig.spec.json

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 5, 2023 6:47pm

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✅ Successfully ran 8 targets

• nx run-many -t e2e-macos --parallel=1 --exclude=e2e-detox
• nx affected --target=e2e --base=ee1f7c13dd33c148bfa81466dad23dfafce4d4f0 --head=90603c4235bc6031bf3ff3ba08ac145f76c3d140 --parallel=1
• nx affected --target=test --base=ee1f7c13dd33c148bfa81466dad23dfafce4d4f0 --head=90603c4235bc6031bf3ff3ba08ac145f76c3d140 --parallel=1
• nx run-many -t check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=build --base=ee1f7c13dd33c148bfa81466dad23dfafce4d4f0 --head=90603c4235bc6031bf3ff3ba08ac145f76c3d140 --parallel=3
• nx affected --target=lint --base=ee1f7c13dd33c148bfa81466dad23dfafce4d4f0 --head=90603c4235bc6031bf3ff3ba08ac145f76c3d140 --parallel=3
• nx-cloud record -- nx format:check --base=ee1f7c13dd33c148bfa81466dad23dfafce4d4f0 --head=90603c4235bc6031bf3ff3ba08ac145f76c3d140
• nx documentation --no-dte

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