Add jstype = JS_STRING

[joticajulian]

Javascript has an issue with uint64. They can not be treated as "number" because the max safe integer in javascript is 2^53 - 1.
https://chromium.googlesource.com/chromium/src/third_party/+/refs/heads/main/protobuf/js/binary/decoder.js?autodive=0%2F%2F#540

I found this issue in the protobuf repo: protocolbuffers/protobuf#3666 (comment) they recommend to use

message dummy { uint64 bigInt = 1; [jstype = JS_STRING] }