Added some data strcutures and their deserialization

main_bmp.go

protocols/bmp/packet/common_header.go

protocols/bmp/packet/common_header_test.go

protocols/bmp/packet/decode.go

protocols/bmp/packet/information_tlv.go

protocols/bmp/packet/information_tlv_test.go

protocols/bmp/packet/initiation_message.go

protocols/bmp/packet/initiation_message_test.go

protocols/bmp/packet/peer_down.go

protocols/bmp/packet/peer_down_test.go

protocols/bmp/packet/peer_up.go

protocols/bmp/packet/peer_up_test.go

protocols/bmp/packet/per_peer_header.go

protocols/bmp/packet/per_peer_header_test.go

protocols/bmp/packet/route_mirroring.go

protocols/bmp/packet/route_monitoring.go

protocols/bmp/packet/stats_report.go

protocols/bmp/packet/stats_report_test.go

protocols/bmp/packet/termination_message.go

protocols/bmp/packet/termination_message_test.go