TL;DR: safer deployment and minor fixes

- Instead of modifying cdb_service_quota_info to return max_batch_size,
a new type (service_quota_info_batch) and a new function
(cdb_service_quota_info_batch) are created. That makes deployment safe.
- Fixes geocoding with forced batch size 1.
- Improves namespacing for count_estimate (->
cdb_dataservices_client.cdb_count_estimate).
- Improves namespacing for jsonb_array_casttext (->
cdb_dataservices_client.cdb_jsonb_array_casttext).

client/sql/05_utils.sql

@@ -1,5 +1,5 @@
 -- Taken from https://wiki.postgresql.org/wiki/Count_estimate
-CREATE FUNCTION count_estimate(query text) RETURNS INTEGER AS
+CREATE FUNCTION cdb_dataservices_client.cdb_count_estimate(query text) RETURNS INTEGER AS
 $func$
 DECLARE
     rec   record;
@@ -15,6 +15,6 @@ END
 $func$ LANGUAGE plpgsql;
 
 -- Taken from https://stackoverflow.com/a/48013356/351721
-CREATE OR REPLACE FUNCTION jsonb_array_casttext(jsonb) RETURNS text[] AS $f$
+CREATE OR REPLACE FUNCTION cdb_dataservices_client.cdb_jsonb_array_casttext(jsonb) RETURNS text[] AS $f$
     SELECT array_agg(x) || ARRAY[]::text[] FROM jsonb_array_elements_text($1) t(x);
 $f$ LANGUAGE sql IMMUTABLE;