Add attempt fees for all coldkey transaction types

[ppolewicz]

There should be a:

• neuron registration ATTEMPT fee
• subnet registration ATTEMPT fee

and probably a fee for every transaction a coldkey does. These transactions are being spammed endlessly for no reason (when max neurons for a given registration period were registered already, when the given hotkey is actually registered already in the subnet, and so on) (I'm not making it up, people are running looped scripts doing these).

A small fee (like the fee for staking attempt, which is like $0.05 rn) should be collected to disincentivize spamming the chain.

The question is whether it should include the subnet owner transaction types such as hyperparameter changes.

It does not need to include transactions issued by root.

In the future on hotkeys we might also want to have a lock (which is returned on success) payable with alphas, but that probably requires a wider discussion and it is not part of this ticket.

[davblash]

I think it's a good idea.
In some subnets, spam registration is serious, to the point that ordinary minors have no opportunity to register their neurons.