Fix/delegate all

[the-mx]

Changes made:

1. Fixed the issue when --all option is used for delegate-stake and undelegate-stake.
2. Existential deposit is requested from the subtensor (previously: hardcoded 1`000 rao).
3. Fixed the issue when updated staking value (existential deposit subtracted) is not used for the stake or unstake.
4. Unit tests updated to catch the previous error.

[thewhaleking]

Overall good; let's just change the arg name to avoid name shadowing.

[thewhaleking]

Let's change this to staking_balance_ to avoid name shadowing.

[the-mx]

Changed.

[ibraheem-abe]

Hey!

Since this also include undelegating, we should also make a distinction here when unstaking all:

    if amount is None:
        # Stake it all.
        if delegate_string == "delegate":
            staking_balance = Balance.from_tao(my_prev_coldkey_balance.tao)
        else:
            # Unstake all
            staking_balance = Balance.from_tao(my_prev_delegated_stake.tao)
    else:
        staking_balance = Balance.from_tao(amount)

[the-mx]

Fixed.

Unit tests need to be updated as well to check for the wallet balance change. Unit tests stopped working locally for me (infinite wait for the local subtensor). Once I resolve the issue I will update the tests too.

[the-mx]

Unit tests updated.

However, I couldn't check the delegate balance when staking all. Float existential deposit, some bug or output value got truncated (rounded). Used wallet balance instead. Open for suggestions or could be just merged as is :)

[thewhaleking]

This looks good. I just want to test out something with regard to the checking staked balance instead of coldkey balance before merging.