Extrinsic update

[ifrit98]

Create a generic extrinisc handler for substrate interface. This allows us to refactor a majority of subtensor calls to use this and simplify many of the implementations.

subtensor = bt.subtensor()

receipt = subtesor.send_extrinsic(
    wallet=wallet,
    module="SubtensorModule", # subtensor module
    function="set_weights", # function to call
    params={
        "dests": [1, 2, 3],
        "weights": [1, 2, 3],
        "netuid": 1,
        "version_key": 0,
    },
    period=10,  # set the amount of blocks the txn should live in the mempool before being cleared
    wait_for_inclusion=False,
)

This PR also:

• fixes subtensor.set_weights to automatically update the nonce during retries and removes immortal txns by default