Move Category model and repository to domain and data layer (#8967)

To keep the commit from being 100+ files the interactors wasn't moved.

The domain module like the data module uses `tachiyomi` instead of `eu.kanade.tachiyomi` for package names

app/build.gradle.kts

@@ -142,6 +142,7 @@ dependencies {
     implementation(project(":core"))
     implementation(project(":source-api"))
     implementation(project(":data"))
+    implementation(project(":domain"))
 
     // Compose
     implementation(platform(compose.bom))