Elijah Mooring

With types like `PropertyDef` and `TsTypeDef` unavailable, it is unnecessarily challenging to consume the rust api.

**Features** - [x] Rust lib for backend implementation - [x] Tower service - [x] Creates/manages sessions - [x] ~~Watches/invalidates objects~~ (this is now deferred to the server) - [ ]...

I also rewrote an additional url import so that it points to the deps.ts file. Fixes #27