feat(VOtpInput): add density prop

[J-Sek]

• not exactly the same as VTextField, because these are not meant to be placed side-by-side
• "comfortable" makes the fields square and suitable for rounded="pill"

Markup:

<template>
  <v-app theme="dark">
    <v-container class="d-flex justify-center">
      <v-container width="400" class="mx-0">
        <v-otp-input />
        <v-otp-input density="comfortable" />
        <v-otp-input density="compact" />
      </v-container>
      <v-divider vertical />
      <v-container width="400" class="mx-0 px-10">
        <v-text-field class="py-3" hide-details variant="outlined" />
        <v-text-field class="py-3" hide-details variant="outlined" density="comfortable" />
        <v-text-field class="py-3" hide-details variant="outlined" density="compact" />
      </v-container>
    </v-container>
  </v-app>
</template>