UR.fromBuffer Method Should Accept a type Parameter

[theanmolsharma]

The fromBuffer method in the UR class currently does not accept a type parameter, which limits its flexibility. As the constructor of the UR class accepts a _type parameter, fromBuffer should also accept a type argument to allow for more versatile usage.

Current Behavior:

• The fromBuffer method only takes a Buffer as an argument and defaults the type to 'bytes'.

public static fromBuffer(buf: Buffer) {
  return new UR(cborEncode(buf));
}

Expected Behavior:

The fromBuffer method should accept an optional type parameter that gets passed to the constructor of the UR class. If the type is not provided, it should default to 'bytes'.

Proposed Change:

public static fromBuffer(buf: Buffer, type: string = 'bytes') {
  return new UR(cborEncode(buf), type);
}

Impact:

• This change will enhance the flexibility and usability of the UR class, making it easier to work with various types of data.

[theanmolsharma]

I can work on this change if the maintainers consider it a good addition.
cc @antonispoulakis @xardass