[BUG] Typescript bindings: structs not exported

[rsodre]

Describe the bug
Structs used in contract calls, but not in any models, are not being exported.

To Reproduce

Generate typescript bindgens for a contract with a call like this...
( from pistols/fools branch)

// https://github.com/underware-gg/pistols/blob/fools/dojo/src/systems/game.cairo
use pistols::types::rules::{RewardValues};
#[starknet::interface]
pub trait IGame<TState> {
  // ...
  fn calc_season_reward(self: @TState, table_id: felt252, duelist_id: u128, lives_staked: u8) -> RewardValues;
  // ...
}

// https://github.com/underware-gg/pistols/blob/fools/dojo/src/systems/bank.cairo
use pistols::models::pool::{PoolType, LordsReleaseBill};
#[starknet::interface]
pub trait IBank<TState> {
  // ...
  fn release_lords_from_fame_to_be_burned(ref self: TState, bills: Span<LordsReleaseBill>) -> u128;
  // ...
}

Expected behavior
The structs RewardValues and LordsReleaseBill should be exported to typescript.