Conversion Utility from Aperio to and from caMicroscope annotations

**Is your feature request related to a problem? Please describe.**
Aperio also has a geometric annotation format, analogous to caMicroscope's "marks" (extended geoJson). It would be nice to convert between these formats.

**Describe the solution you'd like**
The lightest touch is the best, so there's kind of a priority list for implementations. From "best" to "worst":
- Using javascript in browser, not requiring a new microservice
- Using wasm or similar in browser, not requring a new microservice (preferred less due to slight preference to keep a single language as possible)
- Extending an existing service (maybe iip or security middleware?)
- Addition of a new microservice

**Additional context**
We can probably get a few sample annotations in aperio's format upon request.