subtensor

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#513 introduced the #[freeze_struct] attribute which allows you to "lock" a storage struct such that any changes to it result in a new hash code that is enforced at compile time.

A few additional features would enhance this:

• [ ] ignore changes to generic name in hash code calculation (verify that this is actually harmless)
• [ ] ignore changes to field names in hash code calculation (verify that this is actually harmless)
• [x] custom linting framework
• [x] an automatic lint requiring this on storage structs