Add some missing wrappers (#1139)

* Add some missing wrappers:

sqlite3_value_subtype
sqlite3_result_subtype
sqlite3_changes64
sqlite3_db_readonly
sqlite3_txn_state
sqlite3_stmt_isexplain
sqlite3_vtab_config
sqlite3_index_info.idxFlags
sqlite3_index_info.colUsed
sqlite3_index_info.idxStr
sqlite3_vtab_collation

* Mark series VTab as innocuous and csv as direct only

src/types/value_ref.rs

@@ -257,4 +257,7 @@ impl<'a> ValueRef<'a> {
             _ => unreachable!("sqlite3_value_type returned invalid value"),
         }
     }
+
+    // TODO sqlite3_value_nochange // 3.22.0 & VTab xUpdate
+    // TODO sqlite3_value_frombind // 3.28.0
 }