Add parser transform API

[drwpow]

Changes

Satisfies #399 by adding a way to preprocess tokens. Calling it “transform” because it mirrors a lot of standard AST visitor patterns

How to Review

• Tests added.

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: ccb0fbd2cc836286715e6152bdedc398b13ff7e7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 12 packages

Name	Type
@terrazzo/parser	Patch
@terrazzo/cli	Patch
@terrazzo/plugin-css	Patch
@terrazzo/plugin-js	Patch
@terrazzo/plugin-tailwind	Patch
@terrazzo/token-tools	Patch
@terrazzo/plugin-sass	Patch
@terrazzo/plugin-swift	Patch
@terrazzo/token-lab	Patch
@terrazzo/use-color	Patch
@terrazzo/react-color-picker	Patch
@terrazzo/tiles	Patch

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