Add function cdb_routing_with_waypoints

Add routing with waypoints functions to client and server. Includes
signature checks tests for the Postgresql functions and unit and
integration tests for the Python library.

Add client v0.6.0 and server v0.9.0

server/extension/test/sql/95_route_between_points_test.sql

@@ -0,0 +1,15 @@
+-- Check for routing point to point signatures
+SELECT exists(SELECT *
+              FROM pg_proc p
+              INNER JOIN pg_namespace ns ON (p.pronamespace = ns.oid)
+              WHERE ns.nspname = 'cdb_dataservices_server'
+              AND proname = 'cdb_route_point_to_point'
+              AND oidvectortypes(p.proargtypes)  = 'text, text, geometry, geometry, text, text[], text');
+
+-- Check for routing waypoint route signatures
+SELECT exists(SELECT *
+              FROM pg_proc p
+              INNER JOIN pg_namespace ns ON (p.pronamespace = ns.oid)
+              WHERE ns.nspname = 'cdb_dataservices_server'
+              AND proname = 'cdb_route_with_waypoints'
+              AND oidvectortypes(p.proargtypes)  = 'text, text, geometry[], text, text[], text');