feat(Meter): new component (#827)

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

docs/components/content/examples/MeterSlotIndicatorExample.vue

@@ -0,0 +1,15 @@
+<script setup>
+const used = ref(84.2)
+
+const total = 238.42
+</script>
+
+<template>
+  <UMeter :value="used" :max="total">
+    <template #indicator="{ percent }">
+      <div class="text-sm text-right">
+        {{ used }}GB used ({{ Math.round(percent) }}%)
+      </div>
+    </template>
+  </UMeter>
+</template>