fix: add delegation token id

[itsyaasir]

Description of change

A quick for the identity move package; currently the build fails because the DelegationToken doesn't have id function.

I opted to use delegation_token_id as a function name as Move doesn't allow using id twice in the same namespace level.

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• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

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Change checklist

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• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
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[itsyaasir]

Superseded by #1454