feat(sidecar): Main entry point binding the gRPC server to 127.0.0.1

sidecar/src/main/kotlin/dev/uatu/sidecar/Main.kt

@@ -1,5 +1,54 @@
 package dev.uatu.sidecar
 
-fun main() {
-    println("uatu-sidecar stub: gRPC server lands in task #10")
+import io.grpc.Server
+import io.grpc.netty.shaded.io.grpc.netty.NettyServerBuilder
+import java.net.InetSocketAddress
+import java.util.concurrent.CountDownLatch
+
+class SidecarServer(
+    private val port: Int,
+    private val service: DriverService,
+) {
+    private var grpcServer: Server? = null
+    private val shutdownLatch = CountDownLatch(1)
+
+    fun start(): Int {
+        val server = NettyServerBuilder.forAddress(InetSocketAddress("127.0.0.1", port))
+            .addService(service)
+            .build()
+        server.start()
+        grpcServer = server
+        Runtime.getRuntime().addShutdownHook(Thread {
+            stop()
+        })
+        return server.port
+    }
+
+    fun awaitTermination() {
+        shutdownLatch.await()
+    }
+
+    fun stop() {
+        grpcServer?.shutdown()
+        shutdownLatch.countDown()
+    }
+}
+
+fun main(arguments: Array<String>) {
+    val port = arguments.indexOf("--port").let { index ->
+        if (index >= 0 && index + 1 < arguments.size) arguments[index + 1].toInt() else 0
+    }
+    val platform = arguments.indexOf("--platform").let { index ->
+        if (index >= 0 && index + 1 < arguments.size) arguments[index + 1] else "android"
+    }
+    val serial = arguments.indexOf("--serial").let { index ->
+        if (index >= 0 && index + 1 < arguments.size) arguments[index + 1] else null
+    }
+
+    val service = DriverService(platform = platform, serial = serial)
+    val server = SidecarServer(port, service)
+    val boundPort = server.start()
+    println("uatu-sidecar listening on 127.0.0.1:$boundPort platform=$platform")
+    System.out.flush()
+    server.awaitTermination()
 }