Connects with conf table, implements helper and adds tests

server/extension/sql/10_helper_test.sql

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+-- Create a conf table
+CREATE TABLE conf (key TEXT NOT NULL PRIMARY KEY, values_json TEXT);
+INSERT INTO conf VALUES ('cds', '{"Manolo Escobar": {"El Limonero":"En stock", "Viva el vino":"Sin stock"}}');
+
+-- Test key retrieval
+SELECT cdb_geocoder_server._get_conf('cds');
+
+-- Test no key exception
+SELECT cdb_geocoder_server._get_conf('no existe');
+
+-- Drop conf table
+DROP TABLE conf;