##  Description

API for iterating over structs defined in module

## Test Plan

New E2E tests:

```
sui-graphql-rpc-e2e-tests$ cargo nextest run \
  -j 1 --features pg_integration             \
  -- structs.move
```

## Stack

- #14929 
- #14930 
- #14934
- #14935 
- #14961 
- #14974