Describe the bug
In the naming module, ServiceController's "create" method has an optional parameter protectThreshold. However, since it is a basic type and has no default value, if this parameter is not provided in actual use, an error will be reported.
naming模块中，ServiceController的create方法有一个可选参数protectThreshold，但由于其是基本类型且无默认值，在实际使用中如果不提供这个参数会导致报错。

Expected behavior
A request sent to the api create with out the param protectThreshold get an ok returned.

Acutally behavior
nacos return this:
caused: Optional float parameter 'protectThreshold' is present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.;

How to Reproduce
curl -X POST "127.0.0.1:8848/nacos/v1/ns/service?serviceName=12e"

Desktop (please complete the following information):

• OS: Windows 10
• Version nacos-server 1.3.2
• Module naming

Additional context
No