fix(VTextField): update value using IME

[xignp]

Description

fixes #15901
v-text-field change to using onInput for IME users.
v-textarea already uses onInput.
Is there a reason why v-text-filed not used it?

Motivation and Context

issue reproduction link CodePen

How Has This Been Tested?

Playground.vue

Markup:

<template>
  <v-app>
    <v-container>
      <v-text-field v-model="field"></v-text-field>
      <p>{{ field }}</p>
      <v-textarea v-model="area"></v-textarea>
      <p>{{ area }}</p>
    </v-container>
  </v-app>
</template>

<script>
import { ref } from "vue";
export default {
  name: "Playground",
  setup() {
    const field = ref("");
    const area = ref("");
    return {
      field,
      area,
    };
  },
};
</script>

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any features but makes things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and backwards compatible changes and next for non-backwards compatible changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)