feat: add all_of and condition to specify a sub jsonschema as a type

[sguiheux]

Hi,

To be a little more specific than the tag: "oneof_type=string,array", I add a new one that use "all_of" and condition to specify the type of field.

type Application struct {
    Name          string          `json:"name"`
    Kind          string          `json:"kind"`
    Specification json.RawMessage `json:"spec" jsonschema_allof_type:"kind=docker:#/$defs/dockerApp, kind=vm:#/$defs/vmApp"`
}

With this type of struct when the content of a field ( Specification ) depends of another one, we can specify in the jsonschema the right type, and make jsonschema validation works

As it does not affect directly the type of field ( because it adds a all_of on the parent ), I do not implements this in the tags jsonschema like oneof_type, cleaner and more readable