[Optimization] Precompiled recursive params

[jake-figma]

We want to recursively render templates without having to parse children during template compilation. We want to have all the nested children params in the params object. This structure would allow for testing outside of the figma context on a nested params object and be more optimized.

Additional benefits:

• know the precise number of children that will render for a template (children that have a template with a shared title + lang), not just the number of children
• know if a template refers to specific params before generating them (Add exportAsync output to params #46 - svg export. we'd only want to supply this for templates that refer to it)