Make account lookup with auth-addr filter instant.

## Problem

Queries for accounts with auth-addr are slow[^1].

## Solution

* Add optional partial index that speeds up the query for accounts with auth-addr
* Modify the auth-addr filer query to make sure it includes the partial index for Postgres & CockroachDB (if enabled)

[^1]: This is a placeholder issue - Nodely is going to do PR for that soon, following tests on [light-indexer](https://nodely.io/docs/public/light-indexer) and [fnet](https://fnet.algorand.green/)