Add GetDimIndices utility to tensor_layout.h

[jantonguirao]

Signed-off-by: Joaquin Anton janton@nvidia.com

Why we need this PR?

Pick one, remove the rest

• Refactoring to improve code reuse:
  Transforming a set of axis names to axis indices for a given layout (e.g. axis_names="WH" layout="HWC" axes=(1, 0)) is becoming a recurrent pattern

What happened in this PR?

Fill relevant points, put NA otherwise. Replace anything inside []

• What solution was applied:
  Added a utility function GetDimIndices that calculates the indices of the axis (axes) specified by axis_names given a layout
  Removed copies of the same utility in Slice and Erase operator
• Affected modules and functionalities:
  Erase and Slice operators
• Key points relevant for the review:
  The function
• Validation and testing:
  Pre-existing Slice and Erase tests
• Documentation (including examples):
  N/A

JIRA TASK: [Use DALI-XXXX or NA]

[jantonguirao]

!build

[dali-automaton]

CI MESSAGE: [1066605]: BUILD STARTED

[dali-automaton]

CI MESSAGE: [1066605]: BUILD PASSED