feat: textual encoding for ICRC-1 account

[roman-kashitsyn]

This change proposes a textual encoding for ICRC-1 accounts.

[letmejustputthishere]

can we provide this as a https://mops.one package?

[roman-kashitsyn]

can we provide this as a https://mops.one package?

I fear only after mops.one implements team ownership for packages (ideally, but not necessarily, using GitHub groups).
I don't think a single identity should own such packages.

[skilesare]

This might be helpful since motoko is wishy washy with blob an [nat8]

public type BytesAccount = { owner : Principal; subaccount : ?[Nat8] };

public func fromBytesAccount(item: BytesAccount) : Account{
    {
      item with
      subaccount = switch(item.subaccount){
        case(null) null;
        case(?val) ?Blob.fromArray(val);
      };
    };
  };