chore(core): move project-json plugin to src

[FrozenPandaz]

Current Behavior

The project-json plugin is at nx/plugins which may be mistaken as being something people can import.

Expected Behavior

The project-json plugin is in src which indicates that it is something people should not import.

Related Issue(s)

Fixes #

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 23, 2023 10:02pm

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✅ Successfully ran 8 targets

• linux nx affected --target=e2e --base=abc147ccac3119f54301d96d50de8f9bccceb963 --head=3bcf82ba1534d9f2e3a2dc7bc4806291fc98e527 --parallel=1
• linux nx affected --target=build --base=abc147ccac3119f54301d96d50de8f9bccceb963 --head=3bcf82ba1534d9f2e3a2dc7bc4806291fc98e527 --parallel=3
• linux nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• linux nx affected --target=lint --base=abc147ccac3119f54301d96d50de8f9bccceb963 --head=3bcf82ba1534d9f2e3a2dc7bc4806291fc98e527 --parallel=3
• linux nx affected --target=test --base=abc147ccac3119f54301d96d50de8f9bccceb963 --head=3bcf82ba1534d9f2e3a2dc7bc4806291fc98e527 --parallel=1
• nx-cloud record -- nx format:check --base=abc147ccac3119f54301d96d50de8f9bccceb963 --head=3bcf82ba1534d9f2e3a2dc7bc4806291fc98e527
• linux nx documentation --no-dte
• macos nx affected -t e2e-macos --parallel=1 --base=abc147ccac3119f54301d96d50de8f9bccceb963 --head=3bcf82ba1534d9f2e3a2dc7bc4806291fc98e527

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[github-actions]

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