dx: raise informative error when inverse_of is missing on STI

[Paul-Bob]

Description

Fixes #3406

In STI models, the inverse_of option is essential on associations for correctly configuring via_* parameters on links.

When Avo encounters an STI model without inverse_of set in the reflection, it will raise an informative error in development environment only.

Checklist:

• 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

Screenshots & recording

class Users::Student < User
  has_many :marks, foreign_key: :student_id
end

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This PR has been merged into main. The functionality will be available in the next release.

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