Introduce simplePluralStringResource methods, as Composable and in StringProvider.

services/toolbox/api/src/main/kotlin/io/element/android/services/toolbox/api/strings/StringProvider.kt

@@ -34,5 +34,30 @@ interface StringProvider {
      * stripped of styled text information.
      */
     fun getString(@StringRes resId: Int, vararg formatArgs: Any?): String
+
+    /**
+     * Returns a localized formatted string from the application's package's
+     * default string table, substituting the format arguments as defined in
+     * [java.util.Formatter] and [java.lang.String.format], based on the given quantity.
+     */
     fun getQuantityString(@PluralsRes resId: Int, quantity: Int, vararg formatArgs: Any?): String
+
+    /**
+     * Similar to [getQuantityString] but with separate resource ids for singular and plural values.
+     * Useful when we want to use different strings for singular and plural forms but not mentioning the actual quantity in the string.
+     * In this case, we cannot use getQuantityString, because some locales have more than two plural forms, and require the quantity to
+     * be part of the resulting strings.
+     * @param resIdForOne Resource id for the case when [quantity] is 1.
+     * @param resIdForOthers Resource id for the other cases ([quantity] is not 1).
+     * @param quantity The quantity to determine whether to use singular or plural form. Must be greater than or equal to 1.
+     * @param formatArgs The format arguments that will be used for substitution in the resulting string. Will be applied to either
+     * the singular or plural string depending on the quantity.
+     * @return The localized string corresponding to the given quantity.
+     */
+    fun getSimpleQuantityString(
+        @StringRes resIdForOne: Int,
+        @StringRes resIdForOthers: Int,
+        quantity: Int,
+        vararg formatArgs: Any?,
+    ): String
 }