Handle known errors (SubtokenDisabled)

[thewhaleking]

Adds a matching table to handle cryptic errors messages (namely SubtokenDisabled).

[camfairchild]

Maybe we can add a ref to the docs here
@MichaelTrestman

Docs should indicate how to enable the subnet via SNOwner call.

[basfroman]

I wouldn't apply customization for this or any other subtensor errors which is listed here.
The best solution is to improve the error description on the subtensor side. This will be a centralized error storage center. But with a more understandable description.
I suggest opening an issue to change the description.

[basfroman]

Maybe we can add a ref to the docs here @MichaelTrestman

Docs should indicate how to enable the subnet via SNOwner call.

A great solution would be to have a page like https://docs.bittensor.com/subtensor-nodes/subtensor-error-messages, but not only for custom subtensor errors, but for all from here.
Then it would be possible to automatically create a link to the error by an #anchor that would be the name of the error. The resulting error would be attached to the message.
like example https://docs.bittensor.com/subtensor-nodes/subtensor-error-messages#SubtokenDisabled