feat(generators): add angularJson option to app.nest

[dungahk]

Description

Add the project to angular.json along with a couple of targets.

Tech debt

It still misses the test target

Related issues

close #94

Logic behind

I would like to use this function (https://github.com/nrwl/nx/blob/master/packages/schematics/src/collection/node-application/index.ts#L155) but it is not exported, so what I created a temp Tree and used it to run the node-app schematic from Nx and get the angular.json project object generated.

i.e:
``

{
"nest-api": {
      "root": "apps/nest-api",
      "sourceRoot": "apps/nest-api/src",
      "projectType": "application",
      "prefix": "nest-api",
      "schematics": {},
      "architect": {
        "build": {
          "builder": "@nrwl/builders:node-build",
          "options": {
            "outputPath": "dist/apps/nest-api",
            "main": "apps/nest-api/src/main.ts",
            "tsConfig": "apps/nest-api/tsconfig.app.json"
          },
          "configurations": {
            "production": {
              "optimization": true,
              "extractLicenses": true,
              "inspect": false,
              "fileReplacements": [
                {
                  "replace": "apps/nest-api/src/environments/environment.ts",
                  "with": "apps/nest-api/src/environments/environment.prod.ts"
                }
              ],
              "externalDependencies": "none"
            }
          }
        },
        "serve": {
          "builder": "@nrwl/builders:node-execute",
          "options": {
            "buildTarget": "nest-api:build"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "apps/nest-api/tsconfig.app.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
}

[NathanWalker]

Nice work @dungahk 👍