builder for proto object may be more helperful

[miaomiao1992]

this is my proto:

syntax = "proto3";

message GetRequest {
string name = 1;
int32 age = 2;
repeated string features = 3;
}

this is my rs files:
let req = GetRequest {
name: Cow::Borrowed("name1"),
age: 11,
features: vec![Cow::Borrowed("features 1")],
};

if wo have a builder, we can

let req=GetRequestBuilder::default()
.name("name1")
.age(11)
.features(&["features 1"])
.build();

Is this easier?