Shadowing generated proto java sources (#1146)

Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

disk-buffering/build.gradle.kts

@@ -1,8 +1,10 @@
+import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import ru.vyarus.gradle.plugin.animalsniffer.AnimalSniffer
 
 plugins {
   id("otel.java-conventions")
   id("otel.publish-conventions")
+  id("com.github.johnrengelman.shadow")
   id("me.champeau.jmh") version "0.7.2"
   id("ru.vyarus.animalsniffer") version "1.7.1"
   id("com.squareup.wire") version "4.9.3"
@@ -61,6 +63,13 @@ wire {
   )
 }
 
+tasks.named<ShadowJar>("shadowJar") {
+  archiveClassifier.set("")
+  configurations = emptyList() // To avoid embedding any dependencies as we only need to rename some local packages.
+  relocate("io.opentelemetry.proto", "io.opentelemetry.diskbuffering.proto")
+  mustRunAfter("jar")
+}
+
 // The javadoc from wire's generated classes has errors that make the task that generates the "javadoc" artifact to fail. This
 // makes the javadoc task to ignore those generated classes.
 tasks.withType(Javadoc::class.java) {