Fixes issue 2524, Slot Calculation for Variables that Cross 32-Byte

[Jayakumar2812]

Slot Calculation Incorrect for Variables that Cross 32-Byte Boundaries:

• The function correctly increments slot when offset >= 256 (a full slot), but it does not properly handle cases where a variable starts in one slot but extends into the next.( issue-2524)
• ✅ Fix: If size > (256 - offset), then increment the slot before assigning.

Changes made :

*Added a new struct to StorageLayout.sol to test variables that cross the 32-byte boundary.

• replaced StorageLayout.bin with new values to reflect changes
• added test cases in TEST_storage_layout.json to test variables that cross the 32-byte boundary.
• changed the if condition in read_storage.py

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