feat(persons-on-events): Add Kafka table and materialized view for distinct ID overrides

[tkaemming]

This is the companion to #20326 which actually performs the consuming and writing to the table added there.

[tkaemming]

I think this doesn't need to be blocked by #20187 like I previously thought.

Distinct ID reuse is still an issue that should be solved — but at worst, the current problems won't get any worse with this change, and the data in the overrides should actually be a bit more accurate over time than the data in person_distinct_id2. Since we periodically delete rows from this table after they have been squashed, this will allow some rows that are versioned too low (due to Postgres row deletion and reuse rolling back the version counter) to be written to overrides in cases where they will also be ignored by person_distinct_id2.

In any case, this data is still correctable in both tables in the short term by running the fix script. When #20187 is resolved, we'll want to run a mass repair for the entire dataset, which will also fix any lingering issues here (we'll also want to update that script to create tombstones where it currently just warns about future issues.)

[fuziontech]

looks great!