Change Gather and Slice's attributes into intputs

Context

For Gather and Slice Operator, we didn't keep the same standard as ONNX, some of the inputs were made attributes on Aidge. However these inputs might not be initializers on the ONNX model, so loading these attributes while importing the ONNX model is not possible. This is why this MR is intending to switch those attributes to inputs so we don't have to load them while creating the nodes.

For Gather operator:

• Indices
  
• GatheredShape
  

For Slice:

• Starts
  
• Ends
  
• Axes
  

Modified files

• slice.py
  
• gather.py
  

TODO

• DONE : replace Slice attributes by inputs
  
• DONE : replace Gather attributes by inputs
  

marked this merge request as ready

requested review from @pineapple

requested review from @cmoineau

changed target branch from master to dev

changed the description

approved this merge request

changed the description

mentioned in issue aidge_core#118 (closed)

approved this merge request

added 39 commits

• bb26c7a0...6f081d7c - 37 commits from branch eclipse/aidge:dev
• b96ede44 - switch gather attrs into input
• b60ba3da - switch slice attrs into inputs

Compare with previous version

assigned to @hrouis

added TopicOperator label

changed milestone to %aidge - May 2024

added Fix 🔥🔥 label

added 6 commits

• b60ba3da...79123eb9 - 4 commits from branch eclipse/aidge:dev
• 982823bf - switch gather attrs into input
• a47ed578 - switch slice attrs into inputs

Compare with previous version

enabled an automatic merge when the pipeline for a47ed578 succeeds

merged

mentioned in commit 6982a733