[SQLite] add methods to operate on keyservers table
Summary:
- Representation of data row.
- Methods to modify the table.
- Emscripten bindings.
Note: This could heavily conflict with @marcin's work on deprecating sqlite_orm - we will coordinate to make this smooth and avoid blocking each other.
Depends on D10774
Test Plan: Calling those methods from JS and making sure it works.
Reviewers: inka, marcin
Reviewed By: marcin
Subscribers: ashoat, tomek, marcin
Differential Revision: https://phab.comm.dev/D10775