[native] Make node.id optional

[majetideepak]

Description

Make node.id optional in line with the Java implementation.
Auto-generate node.id if missing.

Motivation and Context

Impact

Test Plan

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Release Notes

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== RELEASE NOTES ==

Prestissimo (Native Execution)
* Make node.id optional :pr:`22815`

[majetideepak]

I verified locally that this works.

[majetideepak]

@amitkdutta can you help review this? Thanks.

[aditi-pandit]

Thanks @majetideepak. Had a minor comment.

[amitkdutta]

Looks good from my end.

[aditi-pandit]

Thanks @majetideepak