feat(bob): add ignore pattern to config

[atlj]

Summary

This adds the possibility to pass custom ignore patterns while working with builder bob.

Test plan

1. Create a new library using create-react-native-library. You can select Native module, and Kotlin & Swift options.
2. Go to package.json, and find the react-native-builder-bob section
3. Replace commonjs target as following:

{
    "exclude": "**/ignore_me/**"
    "targets": [
      "commonjs",
      "module",
      [
        "typescript",
        {
          "project": "tsconfig.build.json"
        }
      ]
    ]
}

4. Create a new folder named src/ignore_me and put .ts files inside it
5. Build the library and make sure the files inside the ignore_me aren't included in the commonjs and module targets.

[satya164]

We are use the pattern of passing top-level options in the argument object (like source, output) and target specific options in the options field. So lets do the same for exclude.