Add webpack's fileReplacements option to rspack's project configuration

[dgmachado]

What problem does this feature solve?

The fileReplacements option can be configured in project.json file and consumed by the Webpack. It's desirable that this option is supported by Rspack.

fileReplacements
Replace files with other files in the build.

What does the proposed API of configuration look like?

         "production": {
          "optimization": true,
          "extractLicenses": true,
          "inspect": false,
          "fileReplacements": [
            {
              "replace": "apps/demo-api/src/environments/environment.ts",
              "with": "apps/demo-api/src/environments/environment.prod.ts"
            }
          ]
          "mode": "production",
          "sourceMap": false,
         }