impl packed fields about protodec HOT 2 CLOSED

 rep_pack
22 06 03 8e 02 9e a7 05

22        // key (field number 4, wire type 2)
06        // payload size (6 bytes)
03        // first element (varint 3)
8E 02     // second element (varint 270)
9E A7 05  // third element (varint 86942)

parse start=0x55d42499b090 end=0x55d42499b09c
2:1
isValidMessage start=0x55d42499b092 end=0x6
0:3
unknown data type
offset 0x1
type = 3
idx  = 0
1: ���
~ SUBMESSAGE1 ====================================
offset 0xc end 0xc
1: "\142\158\167\005"

rep_not_pack
20 03 10 8e 02 10 9e a7 05

parse start=0x55aff8bde090 end=0x55aff8bde09d
0:2
0:2
0:2
~ SUBMESSAGE1 ====================================
offset 0xd end 0xd
2 [
	1: 3
	2: 270
	3: 86942
]