[LABS-446] Use a separate config for pooling information

[Quexington]

This change makes it so that instead of using the application config for storing pooling information (as communication between the farmer and wallet), we instead use a brand new file that does the same thing but without changing the user's config.

The ergonomics of the new drivers are such that you can create a context manager which locks the config and returns you an object representing one item within it. You can edit this object within the context manager and then, when you exit, the object in its final state is automatically saved back to the config. These ergonomics help eliminate a lot of the logic that the farmer and pool wallet had to implement by remembering to lock the config and save when done and do exception handling, etc.

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Note

Medium Risk
Introduces a new on-disk pooling state store and migrates away from config.yaml, touching farmer/wallet/CLI code paths; issues could surface as missing/incorrect pool configuration or migration edge cases.

Overview
Pooling configuration is moved out of config.yaml into a new locked YAML store (pooling/pooling_share_state.yaml) managed via the new PoolingShareState API (add/list/acquire context manager).

Farmer, wallet, and PlotNFT CLI flows are updated to read/update pooling state through PoolingShareState (including payout-instruction and pool-URL updates), and startup now runs perform_migration_from_old_config to copy legacy pool.pool_list entries into the new file and then clear the old list.

Tests are updated accordingly, with new coverage for the standalone pooling-state file and migration behavior, and legacy PoolWalletConfig/config-based tests removed.

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[github-actions]

File	Coverage	Missing Lines
chia/farmer/farmer.py	76.5%	lines 539-541, 740
chia/pools/pool_wallet.py	85.7%	lines 250-251

Total	Missing	Coverage
192 lines	6 lines	96%