Revert "Add the `lombok` Gradle plugin & run `delombok`"

This reverts commit 1f999113

build.gradle

@@ -207,12 +207,6 @@ clean {
 }
 
 protobuf {
-    generateProtoTasks {
-        all().each { task ->
-            task.enabled = false
-        }
-    }
-
     protoc {
         // The artifact spec for the Protobuf Compiler
         artifact = 'com.google.protobuf:protoc:3.18.1'
@@ -261,8 +255,6 @@ javadoc {
     if(JavaVersion.current().isJava9Compatible()) {
         options.addBooleanOption('html5', true)
     }
-
-    source = delombok
 }
 
 task injectGitHash {