refactor: dependency location

[shulaoda]

Summary

Related to #7622

I will start governance again, and some dependencies can be directly addressed using RealDependencyLocation, as its location is actually determined. And in some places, we may need to use SyntheticDependencyLocation and DependencyLocation.

struct RealDependencyRange {
  pub end: u32,
  pub start: u32,
}

struct SyntheticDependencyName {
  pub name: String
}

enum DependencyLocation {
  Real(RealDependencyRange),
  Synthetic(SyntheticDependencyName),
}

Looks good. We might need index for SyntheticDependencyName as well in some places.

Originally posted by @h-a-n-a in #7622 (comment)

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[h-a-n-a]

Thanks again!