Fix old legacy normalization issues that were migrated to url-gen

[patrick-tolosa]

Pull request for @cloudinary/url-gen

• FIx various expression normalization issues that were accidentally migrated from the old V1 SDK.

What does this PR solve?

• Prevent multiple spaces from being normalized to a single _
• Prevent multiple _ from being normalized to a single _
• Add deep tests for the Expression function
• Add a test for namedTransformation to ensure an old legacy bug isn't carried over.
• Removed some es-lint rules that made it really annoying to work on the project.

Final checklist

• Implementation is aligned to Spec.
• Tests - Add proper tests to the added code.