[wpiutil] Change C++ protobuf to nanopb (#7309)

The Google C++ protobuf implementation has issues with dynamic linkage across DLL boundaries because it uses global variables.  It also has a compile-time dependency because the protoc version must exactly match the libprotobuf version.  Using nanopb with a customized generator fixes both of these issues.

Co-authored-by: Gold856 <117957790+Gold856@users.noreply.github.com>

shared/java/javacommon.gradle

@@ -155,6 +155,13 @@ protobuf {
     }
     generateProtoTasks {
         all().configureEach { task ->
+            if (project.hasProperty('skipproto')) {
+                task.builtins {
+                    cpp {}
+                    remove java
+                }
+                return
+            }
             task.inputs.file(rootProject.file("protoplugin/binary/wpiprotoplugin.jar"))
             task.plugins {
                 wpilib {