autosharding: Add module build configuration and protobuf definitions (grpc#13007)

https://github.com/GoogleCloudPlatform/autosharding

Author: shivaspeaks

autosharding/build.gradle

@@ -0,0 +1,71 @@
+plugins {
+    id "java-library"
+    id "maven-publish"
+    id "com.google.protobuf"
+    id "jacoco"
+    id "ru.vyarus.animalsniffer"
+}
+
+description = "gRPC: Autosharding Loadbalancing plugin"
+
+tasks.named("jar").configure {
+    manifest {
+        attributes('Automatic-Module-Name': 'io.grpc.autosharding')
+    }
+}
+
+sourceSets {
+    main {
+        proto {
+            srcDir 'third_party/autosharding/src/main/proto'
+        }
+    }
+}
+
+dependencies {
+    implementation project(':grpc-util'),
+            project(':grpc-core'),
+            project(':grpc-protobuf'),
+            project(':grpc-stub'),
+            libraries.auto.value.annotations,
+            libraries.guava
+    annotationProcessor libraries.auto.value
+    testImplementation libraries.truth,
+            project(':grpc-grpclb'),
+            project(':grpc-inprocess'),
+            project(':grpc-testing'),
+            project(':grpc-testing-proto'),
+            testFixtures(project(':grpc-api')),
+            testFixtures(project(':grpc-core'))
+    signature (libraries.signature.java) {
+        artifact {
+            extension = "signature"
+        }
+    }
+}
+
+tasks.named("compileJava").configure {
+    it.options.compilerArgs += [
+            "-Xlint:-processing",
+    ]
+    appendToProperty(
+            it.options.errorprone.excludedPaths,
+            ".*/build/generated/sources/annotationProcessor/java/.*",
+            "|")
+}
+
+tasks.named("javadoc").configure {
+    failOnError = false
+    exclude 'io/grpc/autosharding/v1/**'
+    exclude 'io/grpc/autosharding/*Provider.java'
+    exclude 'io/grpc/autosharding/internal/**'
+    exclude 'io/grpc/autosharding/Internal*'
+}
+
+tasks.named("jacocoTestReport").configure {
+    classDirectories.from = sourceSets.main.output.collect {
+        fileTree(dir: it, exclude: ['**/io/grpc/autosharding/v1/**'])
+    }
+}
+
+configureProtoCompilation()