[MySQL] Investigate support for migrating GEOMETRY type

[amit-yb]

Migration from sakila database (https://downloads.mysql.com/docs/sakila-db.zip) from MySQL to YB fails because of a GEOMETRY field address.location.

importing      TABLE      
    ERROR: type "geometry" does not exist (SQLSTATE 42704)
    STATEMENT: CREATE TABLE address (
	address_id smallserial,
	address varchar(50) NOT NULL,
	address2 varchar(50),
	district varchar(20) NOT NULL,
	city_id smallint NOT NULL,
	postal_code varchar(10),
	phone varchar(20) NOT NULL,
	location GEOMETRY NOT NULL,
	last_update timestamp without time zone NOT NULL DEFAULT CURRENT_TIMESTAMP,
	PRIMARY KEY (address_id)
)