message: [Improvement] Picker: support html option
diff: <ul :style="wrapperStyle">
  <li
  v-for="(option, index) in options"
  - v-text="getOptionText(option)"
  + v-html="getOptionText(option)"
  class="van-ellipsis"
  :class="b('item', {
  disabled: isDisabled(option),
  