chore(corp/data-import): namespace tables for OpenCorpora data

I'm changing strategies to importing both OC and another dataset
before continuing to normalise the data, as it might be easier to do
in a set of table-constructing queries inside of SQLite with all raw
data in place.

Change-Id: I26b41af80586fc1bfd8e26a6be20579068a82507
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7872
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

corp/russian/data-import/src/main.rs

@@ -89,7 +89,7 @@ fn main() {
 
     let conn = Connection::open(output_path).ensure("failed to open DB connection");
 
-    db_setup::initial_schema(&conn);
+    db_setup::initial_oc_schema(&conn);
 
     // afterwards:
     // add actual IDs to grammemes