Use official Kotlin/Protobuf generator

Previously, we used an unmaintained Kotlin protobuf generator, which
didn't support Apple M1 chips. This commit replaces this dependency with
the official Protobuf generator, which works on Apple M1.

semanticdb-kotlin/build.gradle.kts

@@ -3,7 +3,6 @@ import com.google.protobuf.gradle.*
 plugins {
     kotlin("jvm")
     id("com.google.protobuf") version "0.8.17"
-    id("com.github.marcoferrer.kroto-plus") version "0.6.1"
 }
 
 repositories {
@@ -23,7 +22,7 @@ buildscript {
 dependencies {
     implementation(kotlin("stdlib"))
     implementation("com.google.protobuf:protobuf-java:3.17.3")
-    compileOnly("com.sourcegraph", "semanticdb-javac", "0.6.12")
+    compileOnly("com.sourcegraph", "semanticdb-javac", "0.8.23")
 }
 
 
@@ -45,41 +44,16 @@ afterEvaluate {
     }
 }
 
-krotoPlus {
-    config {
-        create("main") {
-            builder.protoBuilders {
-                useDslMarkers = true
-                unwrapBuilders = true
-            }
-        }
-    }
-}
 
 protobuf {
     protoc {
-        artifact = "com.google.protobuf:protoc:3.15.7"
+        artifact = "com.google.protobuf:protoc:3.17.3"
     }
 
     generatedFilesBaseDir = kotlin.sourceSets.main.get().kotlin.srcDirs.first().path.split(":")[0].removeSuffix("main/kotlin")
 
     plugins {
-        id("kroto") {
-            artifact = "com.github.marcoferrer.krotoplus:protoc-gen-kroto-plus:0.6.1"
-        }
+        kotlin { }
     }
 
-    generateProtoTasks {
-        val krotoConfig = file("${projectDir}/krotoconfig.json")
-        all().forEach { task ->
-            task.inputs.files(krotoConfig)
-
-            task.plugins {
-                id("kroto") {
-                    outputSubDir = "java"
-                    option("ConfigPath=${krotoConfig}")
-                }
-            }
-        }
-    }
 }