return block data when deleting it

[iuwqyir]

TL;DR

Enhanced DeleteBlockData to return deleted block data, enabling better handling of reorgs.

What changed?

Modified the DeleteBlockData method in the storage interface to return the deleted block data:

• Updated the method signature in IMainStorage interface to return ([]common.BlockData, error)
• Implemented the new functionality in ClickHouseConnector to collect and return deleted data
• Modified the individual delete methods (deleteBlocks, deleteLogs, etc.) to return the deleted entities
• Updated the MemoryConnector implementation to match the new interface
• Fixed the mock implementation to support the new signature
• Updated the caller in ReorgHandler to handle the new return value

How to test?

1. Run unit tests to verify the updated interface implementations
2. Test a reorg scenario to ensure deleted block data is properly returned
3. Verify that the reorg handler correctly processes the returned data

Why make this change?

This change improves the reorg handling process by providing access to the deleted block data, which can be useful for:

• Auditing what was removed during a reorg
• Potentially using the deleted data for other purposes
• Making the reorg process more transparent and traceable
• Setting the foundation for making delete and insert operations atomic

[iuwqyir]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• publishing blockchain data #176
• return block data when deleting it #175 👈 (View in Graphite)
• do not pass around pointers to slices and maps #174
• main

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