Refactor hessian service and torch sample layer attention.

[irenaby]

Pull Request Description:

Refactor hessian service.
Add data util for torch.
Update GPTQ trainer - use new data loader for samples and corresponding loss weights, rewrite SLA.

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).

[ofirgo]

Still need to go over the tests but in the meanwhile leaving some comments