@PostMapping("")
    @RequiresPermissions("system:plugin:add")
    public ShenyuAdminResult createPlugin(@Valid @ModelAttribute final PluginDTO pluginDTO) {
        return ShenyuAdminResult.success(pluginService.createOrUpdate(pluginDTO));
    }
create plugin.

@param pluginDTO plugin.
@return {@linkplain ShenyuAdminResult}
shenyu-admin/src/main/java/org/apache/shenyu/admin/controller/PluginController.java