feat: inherit attrs to Textarea + fix Input label color (#245)

* feat: add more attributes to Textarea

* refactor: use `inheritAttrs` option to simplify code

* fix: `Input` label color in dark mode

docs/components/textarea/examples/FwbTextareaExample.vue

@@ -4,7 +4,7 @@
       v-model="message"
       :rows="4"
       label="Your message"
-      placeholder="Write you message..."
+      placeholder="Write your message..."
     />
   </div>
 </template>