feat: support write the types of pointer of simple data types (#2745)

[tzq0301]

No description provided.

[ofekshenawa]

Hey,
Do you think you might be able to write a unit test that validates this? WDYT?

[tzq0301]

Hey, Do you think you might be able to write a unit test that validates this? WDYT?

Hello. I have added a unit test for WriteArg to test the behaviour of the simple data types and the pointer type of them.

The result of the unit test shows that WriteArg the value of the pointer of the simple data types have the same behaviour as the non-pointer types after the modification of internal/proto/writer.go in this PR.