improve: Changed the way we are adding the query and document markers in colbert

[hh-space-invader]

Refactored the way we add ticks in colbert models to be replaced with query and document markers.

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[joein]

why are we cutting back to original_length? I thought we should do it only if we exceed the model's context window size

[hh-space-invader]

But there will be an output mismatch (33) as its expected to be 32 since its the minimum query length.
Please note that I'm inserting the query/document marker to the array, not replacing.