Allow returning ? extends Suggestion or ? extends Iterable<? extends Suggestion>> from suggestion providers

[jpenilla]

Removes the need for casting:

  @Override
  public Iterable<Suggestion> suggestions(final CommandContext<Commander> commandContext, final CommandInput input) {
    return mods().allMods()
      .map(modDescription -> (Suggestion) tooltipSuggestion(
        modDescription.modId(),
        Component.literal(modDescription.name())
      ))
      .toList();
  }

->

  @Override
  public Iterable<? extends Suggestion> suggestions(final CommandContext<Commander> commandContext, final CommandInput input) {
    return mods().allMods()
      .map(modDescription -> tooltipSuggestion(
        modDescription.modId(),
        Component.literal(modDescription.name())
      ))
      .toList();
  }

[github-actions]

Test Results

 84 files  ±0   84 suites  ±0   13s ⏱️ -2s
415 tests ±0  415 ✅ ±0  0 💤 ±0  0 ❌ ±0 
459 runs  ±0  459 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 819b6d0. ± Comparison against base commit 09b3edd.