Provide FindSQLite3.cmake module

Use FindSqlite.cmake from :

https://github.com/root-mirror/root/blob/master/cmake/modules/FindSqlite.cmake

as base for find module for SQLite3. Rename to FindSQLite3.cmake for
correspondance with upstream naming. Add version checking to find
process and use version checking form of FindPackageHandleStandardArgs.

TODO: Provide libs as imported targets