Add ts cart transform

[lhoffbeck]

Added a basic example for CartTransfrom written in TS.

• Example returns Expand operations based on 2 metafields:
  1 - bundles. component_references -> List.productVariant metafield referencing bundle components
  2 - bundles. component_quantities -> List.Integer metafield with component quantities
• For example, the bundle Skincare kit will store in the bundle metafield: "2 creams, one face mask"; if the item Skincare kit is added to the cart, the function will return an Expand operation.

Demo video
Demo product -> black variant (PW gaicru)

[lhoffbeck]

@nickwesselman is it good practice to add tests here or can we ✂️ ?

[nickwesselman]

I will say that in general, we've been avoiding TS examples and sticking to JS and Rust in order to cut down on maintenance. JS is close enough to provide TS developers what they need.