Create @shopify/polaris-migrator package

[sam-b-rose]

Closes #6943

Adds the beginnings of the @shopify/polaris-migrator package. This package applies code transformations to help update
Polaris apps and the Polaris codebase.

Usage

npx @shopify/polaris-migrator <migration> <path>

Run tests for @shopify/polaris-migrator

yarn test --filter=@shopify/polaris-migrator 

Original PR branch: #6701

[github-actions]

size-limit report 📦

Path	Size
polaris-react-cjs	198.94 KB (0%)
polaris-react-esm	133.35 KB (0%)
polaris-react-esnext	188.58 KB (0%)
polaris-react-css	41.81 KB (0%)

[sam-b-rose]

/snapit

[github-actions]

🫰✨ Thanks @samrose3! Your snapshots have been published to npm.

Test the snapshots by updating your package.json with the newly published versions:

yarn add @shopify/[email protected]

yarn add @shopify/[email protected]

[sam-b-rose]

/snapit

[github-actions]

🫰✨ Thanks @samrose3! Your snapshots have been published to npm.

Test the snapshots by updating your package.json with the newly published versions:

yarn add @shopify/[email protected]

yarn add @shopify/[email protected]

[BPScott]

I realised an edge case: We would'nt want to trivially transform the cases where it's doing basic sass math: margin: spacing() + spacing(). In Sass this would compile and work at runtime; however var(--spacing-base) + var(--spacing-base) would compile, but would produce meaningless code that would break at runtime.