Token transform

[mrginglymus]

Changes

Reworking of #621

I realised that the default transformAlias does throw errors on undefined:

terrazzo/packages/token-tools/src/css/lib.ts

Lines 6 to 9 in 8cb471e

	export function defaultAliasTransform(token: TokenNormalized) {
	if (!token) {
	throw new Error('Undefined token');
	}

However, when a user-provided function is given, this assertion is lost.

Instead of having to update every transform, update the entrypoint to wrap any user-provided transformAlias with an assertion. This means we can burn a lot more !.

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[mrginglymus]

This still isn't a huge improvement as we don't know what the token originally was...