I am using the Oracle Developer Tools extension for VS Code (not Visual Studio proper).
But I have not seen a way to debug into a stored procedure.
1. Does supporting remote stepping and debugging into a PL/SQL sproc (or a Java-authored one, but I am mainly interested in PL/SQL sprocs atm) mean it has to support it via JPDA?
2. Does this JPDA support exist, or is there an extension other than this one that is known to support remote PL/SQL sproc debugging from inside VS Code?
1) Yes. In our Visual Studio plugin we use JDWP. Currently we have not implemented this yet for VS Code.
2) I thought I saw a third party extension that implemented this, but I don't recall the name and I never tried it.
Another free option besides our Visual Studio extension is SQL Developer.