feature request: alternative withdrawal method by making arbitrary canister call

It would be similar to wallet_call that is offered by cycle wallet at the moment.

type WalletResultCall = variant {
  Ok : record { return: blob };
  Err : text;
};

//Call Forwarding
  wallet_call: (record {
    canister: principal;
    method_name: text;
    args: blob;
    cycles: nat64;
  }) -> (WalletResultCall);
  wallet_call128: (record {
    canister: principal;
    method_name: text;
    args: blob;
    cycles: nat;
  }) -> (WalletResultCall);

This would enable users to make calls that require cycles. For example, an ICRC token canister may want its fees paid in cycles.

I know that there is a security concern of outstanding call contexts that could prevent ledger from being upgraded. But I still think this is worth discussing.

Start by reviewing the existing cycles-ledger canister API and the cycle wallet's wallet_call and wallet_call128 entry points described in the issue. Assess how arbitrary calls would carry cycles, then document how outstanding call contexts and ledger upgrades are handled. Done requires a decided API and an accepted security and upgradeability approach.