use RawFilePath for opening sqlite databases

use RawFilePath for opening sqlite databases

Fix a crash opening sqlite databases when run in a non-unicode locale,
with a remote that uses a non-unicode filepath. In that situation
converting to Text fails.

The fix needs git-annex to be built with persistent-sqlite 2.13.3.
Building against older versions still works, but that version is used when
building with stack.

Database.RawFilePath is a lot of code copied from persistent-sqlite and
lightly modified, since only 1 function in persistent-sqlite was made to
support RawFilePath. This is a bit of a pain, and I hope that
persistent-sqlite will eventually switch to using OsPath, allowing this
module to be removed from git-annex.

Sponsored-by: k0ld on Patreon