sql: cleanup usage of ToSql

Moved custom ToSql trait including Send + Sync from lib.rs to sql.rs.
Replaced most params! and paramsv! macro usage with tuples.

Replaced paramsv! and params_iterv! with params_slice!,
because there is no need to construct a vector.

src/authres.rs

@@ -308,7 +308,7 @@ async fn dkim_works_timestamp(context: &Context, from_domain: &str) -> Result<i6
         .sql
         .query_get_value(
             "SELECT dkim_works FROM sending_domains WHERE domain=?",
-            paramsv![from_domain],
+            (from_domain,),
         )
         .await?
         .unwrap_or(0);
@@ -325,7 +325,7 @@ async fn set_dkim_works_timestamp(
         .execute(
             "INSERT INTO sending_domains (domain, dkim_works) VALUES (?,?)
                 ON CONFLICT(domain) DO UPDATE SET dkim_works=excluded.dkim_works",
-            paramsv![from_domain, timestamp],
+            (from_domain, timestamp),
         )
         .await?;
     Ok(())