[v10] SimSwap + Extrinsics Improvement

[basfroman]

Core Extrinsics Refactor & Fee Simulation Framework

Summary

This PR introduces a major improvement to the Subtensor extrinsics logic, focusing on fee simulation, parameter validation, and internal API consistency — without breaking any existing external interfaces or E2E tests.
The changes make the SDK more predictable, safer to use, and better aligned with on-chain metadata.

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Changes include

1. New class SimSwapResult:

   • Represents the result of a simulated swap operation (stake-related transactions).
   • Used for pre-computing fees and outcomes before actual on-chain execution.

2. New subpackage bittensor.core.extrinsics.params:

   • Contains dataclasses and helpers for structured parameter extraction from extrinsics.
   • Simplifies interaction with chain calls and enforces consistent argument structures.

3. New Subtensor methods:

   • subtensor.sim_swap: Simulates fees for any staking-related transaction.
   • subtensor.validate_extrinsic_params: Validates and filters extrinsic parameters against on-chain metadata.
   • subtensor.compose_call: Now uses built-in validation via validate_extrinsic_params before composing a GenericCall.
   • subtensor.get_extrinsic_fee: Returns the full fee breakdown for any extrinsic call.

4. Updated Subtensor methods:

   • get_stake_add_fee: Updated parameter list. now uses sim_swap for fee computation.
   • get_stake_movement_fee: Updated parameter list. now uses sim_swap for fee computation.
   • get_unstake_fee: Updated parameter list. now uses sim_swap for fee computation.
   • get_transfer_fee: Now uses Subtensor.compose_call with integrated pre-validation.

5. Standardized extrinsic argument order (wallet, netuid, coldkey_ss58, hotkey_ss58, ...). The following methods now follow a consistent signature pattern across Subtensor's extrinsic related methods:

   • move_stake
   • set_children
   • unstake_all

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Additional improvements

1. ExtrinsicResponse class:

   • Added new fields: transaction_tao_fee, transaction_alpha_fee.
   • Improved unlock_wallet handling logic for safer cleanup.

2. Critically important function check_balance_amount:

   • Extended validation logic for pre-transfer balance checks.

3. SubtensorApi class:

   • Updated to integrate the new parameter validation and fee simulation mechanisms.

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Notes:

• The new implementation prevents invalid extrinsic submissions by validating parameters against live chain metadata before dispatch.
• No breaking changes were introduced — all existing E2E tests pass without modification (except for minor formatting and unused import removals).
• Developers now gain a safer and more transparent workflow when building or simulating transactions, while maintaining full backward compatibility.

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Benefits

• Safer on-chain calls through strict metadata-based validation.
• Unified and cleaner extrinsics API.
• Easier debugging and better fee transparency.
• No changes required for existing test suites or external SDK consumers.

More datafiles in MIGRATION file on this PR.