perf: improve the indexing threshold for the fuse search engine (#849)

#### What type of PR is this?

/kind improvement

#### What this PR does / why we need it:

优化 Console 端使用 fuse.js 搜索引擎的搜索阈值，解决搜索关键词匹配的问题。

#### Which issue(s) this PR fixes:

Fixes https://github.com/halo-dev/halo/issues/3289

#### Screenshots:

before:

![image](https://user-images.githubusercontent.com/21301288/218301830-9cc0ac6e-994c-4994-9701-28e50cc90fa3.png)

after:

<img width="676" alt="image" src="https://user-images.githubusercontent.com/21301288/218301848-0883bbe7-f2ad-4ccb-8802-74920d76ebe0.png">


#### Special notes for your reviewer:

测试方式：

1. 检查 Console 端全局搜索，以及用户/权限管理的搜索是否符合预期。

#### Does this PR introduce a user-facing change?

```release-note
优化 Console 端全局搜索的匹配规则。
```

src/components/dropdown-selector/CategoryDropdownSelector.vue

@@ -56,6 +56,7 @@ watch(
     fuse = new Fuse(categories.value, {
       keys: ["spec.displayName", "metadata.name"],
       useExtendedSearch: true,
+      threshold: 0.2,
     });
   }
 );

src/components/dropdown-selector/TagDropdownSelector.vue

@@ -52,6 +52,7 @@ watch(
     fuse = new Fuse(tags.value, {
       keys: ["spec.displayName", "metadata.name", "spec.email"],
       useExtendedSearch: true,
+      threshold: 0.2,
     });
   }
 );

src/components/dropdown-selector/UserDropdownSelector.vue

@@ -51,6 +51,7 @@ watch(
     fuse = new Fuse(users.value, {
       keys: ["spec.displayName", "metadata.name", "spec.email"],
       useExtendedSearch: true,
+      threshold: 0.2,
     });
   }
 );

src/components/global-search/GlobalSearchModal.vue

@@ -54,6 +54,7 @@ const selectedIndex = ref(0);
 const fuse = new Fuse(searchableItem, {
   keys: ["title", "group", "route.path", "route.name"],
   useExtendedSearch: true,
+  threshold: 0.2,
 });
 
 const searchResults = computed((): SearchableItem[] => {

src/modules/system/roles/RoleList.vue

@@ -52,6 +52,7 @@ watch(
     fuse = new Fuse(value, {
       keys: ["spec.displayName", "metadata.name"],
       useExtendedSearch: true,
+      threshold: 0.2,
     });
   }
 );

src/modules/system/users/UserList.vue

@@ -78,6 +78,7 @@ const handleFetchUsers = async (options?: { mute?: boolean }) => {
     fuse = new Fuse(data.items, {
       keys: ["spec.displayName", "metadata.name", "spec.email"],
       useExtendedSearch: true,
+      threshold: 0.2,
     });
 
     const deletedUsers = users.value.items.filter(