Convert Vectors to SVG, take 2

[mimshwright]

Hi @bernaferrari

I've done another pass on this. There are probably a few things that should be fixed before merging but I wanted to show you. I'm interested in getting your feedback on this since you have a lot more experience with this than I do.

Here's a summary...

1. the conversion to alt nodes adds a bit of metadata to the AltNode.
2. It checks whether the nodes can be flattened. We define some types to look for (e.g. "VECTOR") then we check the nodes and all the child nodes, grandchildren etc. If a node is made up entirely of flattenable nodes or groups that contain only flattenable nodes, it can be flattened.
3. It adds a reference to the original node that was converted.
4. There is a place to store the SVG string generated.
5. In the conversion to code for HTML and Tailwind, the nodes are checked to see if they can be compressed. If so, we use exportAsync() to flatten the node. It gets stored in the svg prop so it doesn't get run more than once.
6. SVG gets wrapped in a div

Known issues:

• There is no loading state for the asynchronous functions
• Seems like there are issues with positioning when there are multiple SVG groups generated. The SVGs probably need to be wrapped in a div with position: absolute
• In the case that you have a bunch of vectors and down in the tree is a text field, exportAsync will be run more than once. Each vector or group that can be flattened will be but the entire thing can't be flattened as one. That seems like a reasonable risk to me though. see examples below:

Without Text:

With Text: