code gen should avoid using *string in generated API spec

[TimShi]

Description

code gen should avoid using *string in generated API spec. This makes it inconvenient to use the string value.

Expected Behavior

expected generated code to use string

type RequestItem struct {
	FirstName string `json:"firstName" binding:"required,max=128"`
	LastName  string `json:"lastName" binding:"required,max=128"`
}

Actual Behavior

type RequestItem struct {
	FirstName *string `json:"firstName" binding:"required,max=128"`
	LastName  *string `json:"lastName" binding:"required,max=128"`
}

Affected Version

v0.14.0

Steps to Reproduce

Follow the README in examples/database to generate code based on contract.

Checklist

• I have read the contributing guidelines
• I have verified this does not duplicate an existing issue