feat: add CCallout component

Author: woothu

src/components/Callout/CCallout.vue

@@ -0,0 +1,14 @@
+<template functional>
+  <div :class="`callout ${props.variant ? 'callout-' + props.variant : ''}`">
+    <slot></slot>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'CCallout',
+  props: {
+    variant: String,
+  }
+}
+</script>

src/components/Callout/Callout.vue

@@ -23,9 +23,6 @@ export default {
     calloutVariant () {
       return this.variant ? `callout-${this.variant}` : ''
     }
-  },
-  mounted () {
-    console.error(this.$options._componentTag + ' component is deprecated and will be removed in coreui-vue 3.0 version')
   }
 }
 </script>

src/components/Callout/index.js

@@ -1,5 +1,8 @@
 import Callout from './Callout'
+import CCallout from './CCallout'
+
 
 export {
-  Callout
+  Callout,
+  CCallout
 }