added ability to merge 2 objects

[kolt-mcb]

Key Changes:
Mask Extraction and Validation:
The method iterates over a list of object IDs, retrieves their corresponding video-resolution masks from either conditioning or non-conditioning outputs, and converts them to binary masks. It includes error messages for cases where an object ID isn’t found or a mask is missing.

Mask Union Operation:
All valid binary masks are combined using a logical OR operation, effectively merging the individual masks into one.

State Update:
The merged mask is assigned to a representative object (the one with the smallest ID among those merged), and the remaining objects are removed from the inference state to avoid redundancy.

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