[resources] Use regular classes for resource qualifiers. (#4892)

To avoid data classes in the public API.

components/resources/library/src/commonMain/kotlin/org/jetbrains/compose/resources/Qualifier.kt

@@ -3,14 +3,48 @@ package org.jetbrains.compose.resources
 interface Qualifier
 
 @InternalResourceApi
-data class LanguageQualifier(
+class LanguageQualifier(
     val language: String
-) : Qualifier
+) : Qualifier {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || this::class != other::class) return false
+
+        other as LanguageQualifier
+
+        return language == other.language
+    }
+
+    override fun hashCode(): Int {
+        return language.hashCode()
+    }
+
+    override fun toString(): String {
+        return "LanguageQualifier(language='$language')"
+    }
+}
 
 @InternalResourceApi
-data class RegionQualifier(
+class RegionQualifier(
     val region: String
-) : Qualifier
+) : Qualifier {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || this::class != other::class) return false
+
+        other as RegionQualifier
+
+        return region == other.region
+    }
+
+    override fun hashCode(): Int {
+        return region.hashCode()
+    }
+
+    override fun toString(): String {
+        return "RegionQualifier(region='$region')"
+    }
+}
 
 @InternalResourceApi
 enum class ThemeQualifier : Qualifier {