DA: Finish remaining work

## Summary

This catch-all issue contains miscellaneous items required to finish our DA MVP. It is the expectation that we will add new items here as we encounter them during development.

## Completion Criteria / List of Outstanding Work
* Support debugging programs without source maps. If the editor (client) side does not hold the src TEAL file, then we must disassemble the byte code, such that we have a “TEAL src” for debugging purposes, and send this to the editor.
* Alternatively, the MVP could limit the experience to debugging contracts you have the source for, and you cannot step into those you do not.