replace database extension into externded file

plugin/src/main/kotlin/dev/inmo/plagubot/KoinDatabaseExtensions.kt

@@ -0,0 +1,11 @@
+package dev.inmo.plagubot
+
+import org.jetbrains.exposed.sql.Database
+import org.koin.core.Koin
+import org.koin.core.scope.Scope
+
+val Scope.database: Database
+    get() = get()
+
+val Koin.database: Database
+    get() = get()

plugin/src/main/kotlin/dev/inmo/plagubot/KoinExtensions.kt

@@ -11,12 +11,6 @@ import org.koin.core.module.Module
 import org.koin.core.scope.Scope
 import kotlin.reflect.KClass
 
-val Scope.database: Database
-    get() = get()
-
-val Koin.database: Database
-    get() = get()
-
 /**
  * Using [single] to register `T` with serializer [configSerializer]
  *