Add support for SymInt start values in slice_scatter_decomposition

[shahe-nv]

Description

Add support for SymInt start values in slice_scatter_decomposition.

This fixes a crash issue when I run with ZoomASR.

Fixes # (issue): None

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[meta-cla]

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[apbose]

Hi can you have a testcase for the above?

[shahe-nv]

Hi, I tested with my ZoomASR code. Without this, it will crash. After adding this it will run.