fix: improvements (layout element shuffling and allow more strategies) in experimental two-stages pipeline + define base prompt as constant

[ElHachem02]

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

[codecov]

Codecov Report

❌ Patch coverage is 18.18182% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...erimental/pipeline/threaded_layout_vlm_pipeline.py	0.00%	9 Missing ⚠️

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