Improve Kover setup by using only convention plugins (#6213)

* Improve Kover setup using convention plugins.
* Add a new JVM library convention plugin with Kover support

app/build.gradle.kts

@@ -21,10 +21,8 @@ import extension.allFeaturesImpl
 import extension.allLibrariesImpl
 import extension.allServicesImpl
 import extension.buildConfigFieldStr
-import extension.koverDependencies
 import extension.locales
 import extension.setupDependencyInjection
-import extension.setupKover
 import extension.testCommonDependencies
 import java.util.Locale
 
@@ -40,8 +38,6 @@ plugins {
     // alias(libs.plugins.gms.google.services)
 }
 
-setupKover()
-
 android {
     namespace = "io.element.android.x"
 
@@ -295,8 +291,6 @@ dependencies {
     testCommonDependencies(libs)
     testImplementation(projects.libraries.matrix.test)
     testImplementation(projects.services.toolbox.test)
-
-    koverDependencies()
 }
 
 tasks.withType<GenerateBuildConfig>().configureEach {