add tests and make several replacements/improvements

startup/launcher/src/commonMain/kotlin/HelloWorldPlugin.kt

@@ -0,0 +1,13 @@
+package dev.inmo.micro_utils.startup.launcher
+
+import dev.inmo.kslog.common.i
+import dev.inmo.kslog.common.logger
+import dev.inmo.micro_utils.startup.plugin.ServerPlugin
+import org.koin.core.Koin
+
+object HelloWorldPlugin : ServerPlugin {
+    override suspend fun startPlugin(koin: Koin) {
+        super.startPlugin(koin)
+        logger.i("Hello world")
+    }
+}