feat(x-go-extra-tags): impl

[zdunecki]

Hi, as goJSONSchema is supported I've added also a x-go-extra-tags to be loser to JSON schema plugin convention. The goal is like that:

 "properties": {
    "key": {
      "type": "string",
      "description": "desc",
      "x-go-extra-tags": "env:'SERVER_URL'"
    }
  }

type XGoExtraTags struct {
	// desc
	Key *string `json:"key,omitempty" yaml:"key,omitempty" mapstructure:"key,omitempty" env:'SERVER_URL'`
}

Best,

[codecov]

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