Upgrade Kotlin to 2.1.0 and implement database layer

Updated the Kotlin multiplatform plugin to version 2.1.0 and added the necessary dependency for the Kotlin-simple-logging library. Introduced new components, `Database.kt` and `Migrations.kt`, to manage database connections and migrations, along with adjustments to build configuration artifacts.

build.gradle.kts

@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.plugin.KotlinJsCompilerType
 
 plugins {
-    kotlin("multiplatform") version "2.0.21"
+    kotlin("multiplatform") version "2.1.0"
 }
 
 group = "nl.astraeus"
@@ -19,9 +19,7 @@ repositories {
 
 kotlin {
     jvmToolchain(17)
-    jvm {
-        withJava()
-    }
+    jvm()
     js {
         binaries.executable()
         browser {
@@ -33,6 +31,7 @@ kotlin {
     sourceSets {
         val commonMain by getting {
             dependencies {
+                api("nl.astraeus:kotlin-simple-logging:1.1.1")
                 api("nl.astraeus:kotlin-css-generator:1.0.10")
 
                 implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.6.0")