Case insensitive keys in request body

[gopherus]

Request:
PATCH /v1/api/dev/actor HTTP/1.1
Host: 127.0.0.1:8080
Content-Type: application/json

Both request body values are equivalent:

{
  "Entity": [
    {
      "ActorId":0,
      "FirstName": "Mike",
      "LastName": "Wazowski",
      "LastUpdate": "2023-01-01T00:00:00Z"
    }
  ]
}

{
  "entity": [
    {
      "actorId":0,
      "firstName": "Mike",
      "lastName": "Wazowski",
      "lastUpdate": "2023-01-01T00:00:00Z"
    }
  ]
}

[gopherus]

type Actor struct {
	ActorId    int       `sqlx:"name=actor_id,autoincrement,primaryKey,required"`
	FirstName  string    `sqlx:"name=first_name,required"`
	LastName   string    `sqlx:"name=last_name,unique,table=actor,required"`
	LastUpdate time.Time `sqlx:"name=last_update,required"`
	Has        *ActorHas `setMarker:"true" typeName:"ActorHas" json:"-"  sqlx:"-" `
}