[Refactor] Extract 'FormItem' and 'SettingItem' (#1619)

* Extract SettingItem component

* Extract GeneralSettingItem

* Rename to FormItem

* nit

* nit

src/components/common/CustomFormValue.vue

@@ -0,0 +1,25 @@
+<template>
+  <div ref="container"></div>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted, watch } from 'vue'
+
+const props = defineProps<{
+  renderFunction: () => HTMLElement
+}>()
+
+const container = ref<HTMLElement | null>(null)
+
+function renderContent() {
+  if (container.value) {
+    container.value.innerHTML = ''
+    const element = props.renderFunction()
+    container.value.appendChild(element)
+  }
+}
+
+onMounted(renderContent)
+
+watch(() => props.renderFunction, renderContent)
+</script>