add "compilerOptions.sourceMaps" option is nest-cli-json

[Yiheng]

Is there an existing issue that is already proposing this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe it

none

Describe the solution you'd like

control source map generation via nest-cli.json

{
  "$schema": "https://json.schemastore.org/nest-cli",
  "collection": "@nestjs/schematics",
  "compilerOptions": {
    "sourceMaps": true
  }
}

Teachability, documentation, adoption, migration strategy

No response

What is the motivation / use case for changing the behavior?

avoiding adding more rc/json files.

[Kamil Mysliwiec]

NestJS CLI doesn't generate any source maps