initialize startup module

startup/plugin/build.gradle

@@ -0,0 +1,17 @@
+plugins {
+    id "org.jetbrains.kotlin.multiplatform"
+    id "org.jetbrains.kotlin.plugin.serialization"
+}
+
+apply from: "$mppJavaProjectPresetPath"
+
+kotlin {
+    sourceSets {
+        commonMain {
+            dependencies {
+                api libs.koin
+                api libs.kt.serialization
+            }
+        }
+    }
+}

startup/plugin/src/commonMain/kotlin/ServerPlugin.kt

@@ -0,0 +1,34 @@
+package dev.inmo.micro_utils.startup.plugin
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.builtins.serializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.json.JsonObject
+import org.koin.core.Koin
+import org.koin.core.module.Module
+
+@Serializable(ServerPlugin.Companion::class)
+interface ServerPlugin {
+    fun Module.setupDI(config: JsonObject) {}
+
+    suspend fun Koin.startPlugin() {}
+
+    companion object : KSerializer<ServerPlugin> {
+        override val descriptor: SerialDescriptor
+            get() = String.serializer().descriptor
+
+        override fun deserialize(decoder: Decoder): ServerPlugin {
+            val kclass = Class.forName(decoder.decodeString()).kotlin
+            return (kclass.objectInstance ?: kclass.constructors.first { it.parameters.isEmpty() }.call()) as ServerPlugin
+        }
+
+        override fun serialize(encoder: Encoder, value: ServerPlugin) {
+            encoder.encodeString(
+                value::class.java.canonicalName
+            )
+        }
+    }
+}