More integer types

[jessekrubin]

Howdy @samchon

you have the following integer types:

• int32
• uint32
• uint64
• int64

Does typia support other <64 bit ints and/or could they be added?

Would like:

• int8
• uint8
• int16
• uint16

Bonus points (imo) would be 128 bit ints too

[samchon]

Current integer types (uint32 ~ int64) are prepared for protobuf supporting.

It would be good to challenge this issue by sending a PR.