Collapse inlined variables into templates

[benmccann]

Describe the problem

In #13075 we generate code like:

const x = "foo";
$.template(`hello ${x}`);

It would be nicer if this were simply:

$.template(`hello foo`);

Describe the proposed solution

Ideally this is implemented by esbuild (evanw/esbuild#3570) and Oxc (oxc-project/oxc#2646). Failing that, we may have to implement it ourselves

Importance

nice to have