feat: writeOnly and readOnly added to json tag

[enverbisevac]

Minor improvement to support openapi spec writeOnly and readOnly https://swagger.io/specification/v3/
example:

type User struct {
        ......
        FullName string `json:"full_name"
	Password   Password `json:"password,writeOnly"`

when object is serialized password is not present:

{
    .....
    "full_name": "Admin",
}

[enverbisevac]

Does anyone have time to look at this PR? or others PRs as well I see no activity for long period of time.

[f3oall]

Hey @enverbisevac,

I'm looking forward to this feature as well. Though there can be an issue with scopes, while it makes sense for serializing/deserializing in API scope, JSON is also used in DBs (e.g. PostgreSQL). When you use one structure both for DB and API it can raise a conflict.