Create new 'bittensor-sdk` package

[roman-opentensor]

As part of the EPIC: Bittensor Redesign , we need to update the bittensor repos to become an SDK that can be used by Python developers.

AC:

• Remove wallet and related content. Start using pip installable bittensor-wallet. Fix related tests. PR #2191.
• Recreate Bittensor Config. Re-use config as it is with a bit cleaner code.
• Make the sub-package structure more independent.
• Code improvement.
• Code refactoring.
• Check all parts of the code for use in bittensor and subnets.
• Subtensor / extrinsics optimization (according to backward compatibility).
• Check the entire code base for compliance with the Cortex coding standard.

The list of AC could be updated.

[roman-opentensor]

Part 1: #2191

[roman-opentensor]

Part 2: #2204

[roman-opentensor]

Part 3: #2206

[roman-opentensor]

Part 4: #2210

[roman-opentensor]

review session PR: #2220