This week, the S4TF team encountered several failures building toolchains:

1. Outdated Package.resolved in [swift/FastaiNotebook_11_imagenette](https://github.com/fastai/fastai_dev/blob/master/swift/FastaiNotebook_11_imagenette/Package.resolved).
2. A regression in `ParameterlessLayer` caused by a change in type inference behavior in [apple/swift#32578](apple/swift#32578).

This PR includes two workarounds that unblock toolchain builds:
1. Remove Package.resolved ([swift-apis/1036](tensorflow/swift-apis#1036)). Since this file is regenerated on build, it's often not necessary to include in source control.
2. Add a typealias to instances conforming to `ParameterlessLayer`, which was effective in swift-apis and swift-models (see [tensorflow/swift-apis#1037](tensorflow/swift-apis#1037)).

I'm happy to create an additional PR to remove the other Package.resolved files in this repo and add to .gitignore, if desired.