Fix/code quality improvements sdkv10

[wnqqnw19]

Description

This PR improves code quality and consistency in bittensor/core/errors.py.

Changes Made:

1. Added all export list: Defines the public API for the errors module and improves clarity on which exceptions are intended for external use.
2. Reorganized exception definitions: Moved BalanceTypeError and BalanceUnitMismatchError from the end of the file to after MaxAttemptsException for better logical grouping.
3. Standardized docstring formatting: Converted single-line docstrings to multi-line format (triple-quoted strings) for consistency across chain transaction error classes.
4. Fixed SynapseDendriteNoneException initialization bug:
   • Now properly sets self.synapse attribute before calling the parent constructor
   • Ensures the synapse parameter is correctly passed to the parent SynapseException class
5. Removed redundant aliases: Cleaned up unnecessary alias assignments that were already imported from async_substrate_interface.errors.

Impact:

• Better code organization and maintainability
• Fixed potential bug in SynapseDendriteNoneException
• Improved API clarity with all list
• Consistent documentation style

[basfroman]

Revert docstings changes for existing errors.

[basfroman]

have you read you changes? Why is this here? We don't need to store synapse as class attribute.

[wnqqnw19]

I've fixed them @basfroman