Add functionality for custom problem details extensions

[AmielCyber]

Add functionality for custom problem details extensions to replace errors. The default extension in ASP.NET is errors. You may have a different name for this property. Hence, I will implement the option to change errors to the name of your extension.
For example:
From default

"errors": {
    "PasswordRequiresDigit": [
      "Passwords must have at least one digit ('0'-'9')."
    ],
    "PasswordRequiresUpper": [
      "Passwords must have at least one uppercase ('A'-'Z')."
    ],
    "PasswordRequiresNonAlphanumeric": [
      "Passwords must have at least one non alphanumeric character."
    ]
}

to

"invalid-params": {
   ...
  }