feature[Excel]: support bookType option (#1144)

Documentation: https://panjiachen.github.io/vue-element-admin-site/feature/component/excel.html

src/views/excel/components/AutoWidthOption.vue

@@ -0,0 +1,30 @@
+<template>
+  <div style="display:inline-block;">
+    <label class="radio-label">Cell Auto-Width: </label>
+    <el-radio-group v-model="autoWidth">
+      <el-radio :label="true" border>True</el-radio>
+      <el-radio :label="false" border>False</el-radio>
+    </el-radio-group>
+  </div>
+</template>
+
+<script>
+export default {
+  props: {
+    value: {
+      type: Boolean,
+      default: true
+    }
+  },
+  computed: {
+    autoWidth: {
+      get() {
+        return this.value
+      },
+      set(val) {
+        this.$emit('input', val)
+      }
+    }
+  }
+}
+</script>