feat(Meter): new component (#827)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

docs/components/content/examples/MeterSlotLabelExample.vue

@@ -0,0 +1,15 @@
+<script setup>
+const used = ref(84.2)
+
+const total = 238.42
+</script>
+
+<template>
+  <UMeter :value="used" :max="total">
+    <template #label="{ percent }">
+      <p class="text-sm">
+        You are using {{ Math.round(used) }}GB ({{ Math.round(100 - percent) }}%) of space
+      </p>
+    </template>
+  </UMeter>
+</template>