give_user_plot
@mount("dev.give_user_plot")
operation give_user_plot(id: integer, location_x: integer, location_y: integer, plot_width: integer, plot_height: integer, water_type: text, water_quality: decimal, soil_type: text, soil_fertility: decimal, island: text, region: text, owner_id: byte_array, cells: list<cell>)