core/translate: prevent aliasing internal subquery identifiers

[PThorpe92]

closes #3620

SQLite displays column names that are otherwise un-named (or would contain whatever internal identifier otherwise), as columnx where x is the index into the result columns.

Turso previously did this, and just used the internal subquery identifier:

this PR swaps out the internal ident:

and prevents a user from explicitly either AS or Elided alias'ing a table or selecting identifier.* using the internal subquery prefix, preventing issues like the one referenced in #3620

[nyrkio]

Nyrkiö Report for Commit: ed1b6c9

No performance changes detected.

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