Reading 30mb files as json binary properties is slow

[lodejard]

Maybe this is an optimization problem, or maybe it's a bad idea to read several dozen mb of binary files as a base64 encoded json property in order to upload it to blob storage.

We should consider adding a way to declare the body of an api as coming from a file instead of being declared as a binary json property. Something like a top level property like bodyFile or input.

Should also add a command-line switch named -i|--input in order to provide multiple base paths. Reading files which are not part of the template folder would be relative to one of those paths. It should also be impossible for a workflow to read any file that isn't a sub-path of an --input directory.

[lodejard]

@JSchenken fyi