chore: Use Kotlin for ReVanced API (#169)

This commit converts the entire project to a KTor project written in Kotlin.
Various APIs have been updated, removed, or changed.
A proxy is present to allow migration between the old and this API, which can serve requests to endpoints from the old API.

src/main/kotlin/app/revanced/api/command/StartAPICommand.kt

@@ -0,0 +1,46 @@
+package app.revanced.api.command
+
+import app.revanced.api.configuration.*
+import io.ktor.server.engine.*
+import io.ktor.server.jetty.*
+import picocli.CommandLine
+import java.io.File
+
+@CommandLine.Command(
+    name = "start",
+    description = ["Start the API server"],
+)
+internal object StartAPICommand : Runnable {
+    @CommandLine.Option(
+        names = ["-h", "--host"],
+        description = ["The host address to bind to."],
+        showDefaultValue = CommandLine.Help.Visibility.ALWAYS,
+    )
+    private var host: String = "0.0.0.0"
+
+    @CommandLine.Option(
+        names = ["-p", "--port"],
+        description = ["The port to listen on."],
+        showDefaultValue = CommandLine.Help.Visibility.ALWAYS,
+    )
+    private var port: Int = 8888
+
+    @CommandLine.Option(
+        names = ["-c", "--config"],
+        description = ["The path to the configuration file."],
+        showDefaultValue = CommandLine.Help.Visibility.ALWAYS,
+    )
+    private var configFile = File("configuration.toml")
+
+    override fun run() {
+        embeddedServer(Jetty, port, host) {
+            configureDependencies(configFile)
+            configureHTTP()
+            configureSerialization()
+            configureSecurity()
+            configureOpenAPI()
+            configureLogging()
+            configureRouting()
+        }.start(wait = true)
+    }
+}