updated protobuf files for all languages

[MathJud]

updates all protobuf source files for all languages to current version.

[brenodt]

Hey Math, here's a breakdown of what happened:

Since the last major release of the protoc_plugin for dart, version 21.0.0, the proto file generation breaks our code, as they’ve removed factory constructors from the generated files.

This change is being retracted in favor of having a flag to decide if you want factory constructors or not; see:

• Add back named constructor arguments (or include as an option) · Issue #850 · google/protobuf.dart
• Add a flag to generate constructor arguments by osa1 · Pull Request #855 · google/protobuf.dart

As a temporary workaround, we just need to make sure that the version of the plugin installed locally is the version 20.0.1, which can be achieved by:

dart pub global deactivate protoc_plugin
dart pub global activate protoc_plugin 20.0.1

Then, regenerate the proto files by running:

cd rust/libqaul/src/rpc/protobuf_build_scripts
./build_dart.sh

Once the plugin's PR nº 855 lands, we should review to see if we need to change the build command and/or documentation. I already added this task to my backlog.

You can merge this PR now!

[MathJud]

@brenodt Thanks for this investigation & documentation of the findings