feat: improve internal sql interface

Switches from rusqlite to sqlx to have a fully async based interface
to sqlite.

Co-authored-by: B. Petersen <r10s@b44t.com>
Co-authored-by: Hocuri <hocuri@gmx.de>
Co-authored-by: link2xt <link2xt@testrun.org>

src/sql/error.rs

@@ -0,0 +1,19 @@
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("Sqlx: {0:?}")]
+    Sqlx(#[from] sqlx::Error),
+    #[error("Sqlite: Connection closed")]
+    SqlNoConnection,
+    #[error("Sqlite: Already open")]
+    SqlAlreadyOpen,
+    #[error("Sqlite: Failed to open")]
+    SqlFailedToOpen,
+    #[error("{0}")]
+    Io(#[from] std::io::Error),
+    // #[error("{0:?}")]
+    // BlobError(#[from] crate::blob::BlobError),
+    #[error("{0}")]
+    Other(#[from] anyhow::Error),
+}
+
+pub type Result<T> = std::result::Result<T, Error>;