[MINOR] improvement(dashboard): Support sort application info by part…

…ition num

### What changes were proposed in this pull request?

Help to find out the most partition num from application page.

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

No.

### How was this patch tested?

Locally

dashboard/src/main/webapp/src/pages/ApplicationPage.vue

@@ -86,7 +86,7 @@
             </div>
           </template>
         </el-table-column>
-        <el-table-column prop="partitionNum" label="PartitionNum" min-width="180" />
+        <el-table-column prop="partitionNum" label="PartitionNum" min-width="180" sortable />
         <el-table-column
             prop="memorySize"
             label="MemorySize"