[lib] introduce message searching to SQLiteAPI

Summary:
This diff introduces a shared interface on SQLiteAPI so the JS code in lib can use this API on both platforms.

Depends on D12853

Test Plan: Tested later in the stack by @inka.

Reviewers: tomek, inka

Reviewed By: tomek

Subscribers: ashoat, inka

Differential Revision: https://phab.comm.dev/D12854