Prototype an API server

[pudo]

Things an API server could offer:

• An OpenSanctions-specific matching API
• Support for the OpenRefine reconciliation API (see Aleph implementation)
• Export on demand with filters (country, schema)

Should track what's happening in alephdata/followthemoney-compare that we can adopt downstream.

Implementation thoughts?

• Does this want to be implemented in some funky fast programming language (go, rust)?
• Does this keep the data in memory (or use heavy memoization) to be blazing fast?
• Do we ship this to users or run it on an OS-sponsored server? If the latter, is there going to be API accounting?

Requires #106 or similar.

[pudo]

Fixed now, iteration 2 should have specific issues. Lots of work to be done on match quality.