improve account list with asset filter

[brianolson]

postgres.go buildAccountQuery() current implementation when trying to filter on accounts that have some asset fetches all accounts (over 4e6 on mainnet) and filters them client side. Change to filtering inside postgres adding WHERE clauses after all the table JOINs to filter on [assetid] @> qaa.haid (TODO: double check I got the postgres array operator right and that this works with jsonb values). Similar for account with filter on app-id.