refactor(common-enums): migrate to Kotlin Multiplatform

This removes the tight coupling to the Android ecosystem, and allows for
use outside of Kotlin/Android.

* Use the `jvm` target
  * Migrate `main`/`test` to `commonMain`/`commonTest` source-sets
* Remove `libraryType` declaration

No other source changes were made, and should* be compatible with
existing use cases(?)

Closes #14

androidx/common/common-enums/build.gradle.kts

@@ -1,9 +1,7 @@
-import io.github.edricchan03.plugin.library.extensions.LibraryType
 import io.github.edricchan03.plugin.library.setConventions
 
 plugins {
-    `android-library`
-    `kotlin-android`
+    `kotlin-multiplatform`
     io.github.edricchan03.androidx.library
 }
 
@@ -13,29 +11,29 @@ androidxKtx {
         version = "0.1.0-SNAPSHOT"
     }
 
-    libraryType = LibraryType.Android
-
     name = "androidx-ktx-extras-common-enums"
     description = "Common enum utilities for androidx-ktx-extras"
 }
 
-@Suppress("UnstableApiUsage")
-android {
-    namespace = "io.github.edricchan03.androidx.common.enums"
-
-    testOptions {
-        unitTests.all {
-            it.useJUnitPlatform()
+kotlin {
+    jvm {
+        testRuns["test"].executionTask.configure {
+            useJUnitPlatform()
         }
     }
-}
 
-dependencies {
-    testImplementation(libs.kotest.runner.junit5)
-    testImplementation(libs.kotest.assertions.core)
-    testImplementation(libs.kotest.property)
+    sourceSets {
+        commonTest {
+            dependencies {
+                implementation(libs.kotest.runner.junit5)
+                implementation(libs.kotest.assertions.core)
+                implementation(libs.kotest.property)
+            }
+        }
+    }
 }
 
+@Suppress("UnstableApiUsage")
 publishing.publications {
     // TODO: Remove in 0.1.0, see https://github.com/EdricChan03/androidx-ktx-extras/issues/6
     val relocation by registering(MavenPublication::class) {