Pallet for handling all alpha operations

[gztensor]

A pallet for handling all internal alpha transactions, minting, burning, and recycling via a single interface. This feature consists of several PRs.

Development plans

• Handle total alpha issuance, minting, burning, and recycling: PR Pallet alpha-assets #2629.
• Deprecate v1 alpha share pool maps after they have lazy-migrated (finalizing migration).
• Move alpha share pool maps and logic in the alpha-assets pallet, add interface methods for integration and integrate subtensor pallet.
• Isolate alpha balances logic for two account types: (1) System coldkey, and (2) User (coldkey, hotkey).
• Implement transfer method and use for staking and unstaking. Use subnet account IDs for storing SubnetAlhpaIn.