feat: add prepend slot to date/time control renderers

Add optional prepend slot to DateControlRenderer, DateTimeControlRenderer,
and TimeControlRenderer to allow custom content before the input field.

Author: yaffol

packages/vue-vuetify/src/controls/DateControlRenderer.vue

@@ -24,6 +24,9 @@
       @blur="handleBlur"
       v-maska:[options]="maska"
     >
+      <template v-slot:prepend v-if="$slots.prepend">
+        <slot name="prepend" />
+      </template>
       <template v-slot:prepend-inner>
         <v-menu
           v-model="showMenu"

packages/vue-vuetify/src/controls/DateTimeControlRenderer.vue

@@ -24,6 +24,9 @@
       @blur="handleBlur"
       v-maska:[options]="maska"
     >
+      <template v-slot:prepend v-if="$slots.prepend">
+        <slot name="prepend" />
+      </template>
       <template v-slot:prepend-inner>
         <v-menu
           v-model="showMenu"

packages/vue-vuetify/src/controls/TimeControlRenderer.vue

@@ -24,6 +24,9 @@
       @blur="handleBlur"
       v-maska:[options]="maska"
     >
+      <template v-slot:prepend v-if="$slots.prepend">
+        <slot name="prepend" />
+      </template>
       <template v-slot:prepend-inner>
         <v-menu
           v-model="showMenu"