[RNE Rewrite] feat: add semantic segmentation task

[barhanc]

Description

• Adds semantic segmentation task and required native operations for it.
• Adds computer-vision example app screen for semantic segmentation.
• Fixes the performance regression in the argmax introduced in [RNE Rewrite] feat!: add classification task and common utilities for manipulating tensors in CV tasks #1264. The initial implementation from PoC was more efficient for the default axis=-1 case as the internal loop was over contiguous elements. The linked PR changed it so that it was more efficient for axis=0 case, however since the default is axis=-1 this caused a performance regression in the semantic segmentation task.

Introduces a breaking change?

• Yes
• No

Type of change

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Documentation update (improves or adds clarity to existing documentation)
• Other (chores, tests, code style improvements etc.)

Tested on

• iOS
• Android

Testing instructions

• Build the computer-vision example app.
• Test the semantic segmentation screen.

Screenshots

Related issues

Closes #1242

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly
• My changes generate no new warnings

Additional notes