### Summary

This adds the `custom` target to bob. Users are able to pass arbitrary
scripts via this target and bob will call those scripts.

### Test plan

1. Configure bob in a new project
2. Define the `custom` target
3. Define a script that generates some files
4. Call bob build and make sure the script was called with the right
package manager

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Co-authored-by: Satyajit Sahoo <[email protected]>

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### Summary

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Adding `.xcode.env.local` to the `.gitignore`

### Test plan

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screenshots if this changes anything visual. -->

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### Summary

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Upgrading the builder Bob fallback version to `v0.36.0`

I’ve been working on two recently created libraries, and both were
failing to build for iOS due to duplicated symbols caused by codegen. I
checked the Bob builder and saw that this issue was fixed in v0.35.3,
but when creating a new library with `create-react-native-library`, it
was resolving to v0.32.0. It seems the Bob version wasn’t resolving
correctly and was falling back to v0.32.0. So, I upgraded the fallback
version to the latest stable release.

### Test plan

Built for iOS, and CI completed successfully.

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### Summary

I think this was a typo? Otherwise it wouldn't match with [this
line](https://github.com/callstack/react-native-builder-bob/blob/87b0032acd66b7b14a5b358117a3d1497c59baad/packages/create-react-native-library/templates/native-common/android/build.gradle#L62)?

### Test plan

–

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