chore(core): add JSON schema for nx.json

[puku0x]

Current Behavior

No auto-completion for nx.json.

Expected Behavior

Auto-completion for nx.json is available 🙌

// nx.json
{
  "$schema": "./node_modules/@nrwl/tao/src/config/schema.json",
  "implicitDependencies": {
  :
}

Related Issue(s)

Refs #2299
https://github.com/nrwl/nx/blob/e02c02cf709417cf43c4cb363c41888c3e0ed150/packages/tao/src/shared/nx.ts
https://nx.dev/l/r/core-concepts/configuration#configuration

Will be added to schema store in the future?
https://github.com/SchemaStore/schemastore

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[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 9572499. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this branch

Status	Command
	nx affected --target=e2e --base=1560a43acd378743a413b36b27709b9fefbec415 --head=95724996fa06b5eb511071b9a44cbb0b577ff4c2 --exclude=e2e-js,e2e-next,e2e-gatsby,e2e-workspace-create,e2e-workspace-integrations,e2e-workspace-core,e2e-react,e2e-web,e2e-angular-extensions,e2e-angular-core,e2e-cli,e2e-nx-plugin,e2e-storybook,e2e-cypress,e2e-node,e2e-linter...
	nx run-many --target=build --all --parallel=8
	nx run-many --target=build --all --parallel=8

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[puku0x]

Nx Console does similar thing for workspace.json. nrwl/nx-console#1077

[puku0x]

This PR can be closed after nrwl/nx-console#1186 is merged.

[puku0x]

Almost done. nrwl/nx-console@81be231

[puku0x]

Closing due to nrwl/nx-console#1186 was merged.
Nx Console will help us to auto-complete nx.json soon.

[puku0x]

Please use Nx console.
https://github.com/nrwl/nx-console/releases/tag/v17.13.0

[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.