[Feature Request] proto `optional` field

[kkimdev]

Hi, thanks for creating this useful tool!

Though, we couldn't use this as our project's .proto files use optional fields and proxide doesn't seem to recognize it like below.

$ proxide monitor --allow-remote -l 5555 -t localhost:5081 --grpc [...]
Parameter grpc: Parsing error:   --> 73:3
   |
73 |   optional string name = 2;
   |   ^---
   |
   = expected emptyStatement, option, repeated, oneof, mapField, reserved, enum_, or message

Hence this feature request. optional is in the proto spec: https://stackoverflow.com/a/62566052