Hi, thank you for creating such a great framework!
I have a feature request which I think I can contribute, but let me check if you are interested in supporting it.

### Preflight Checklist
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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

### Problem Description
The builtin spellchecker has been supported in https://github.com/electron/electron/pull/20692.
But it does not allow us to check spells programmatically, like [node-spellchecker](https://github.com/felixrieseberg/node-spellchecker)'s `isMisspelled` method.
Chrome's spellcheck_platform provides [CheckSpelling](https://chromium.googlesource.com/chromium/src/+/46ee392970e491fb9ee2523348e23222b40d5119/components/spellcheck/browser/spellcheck_platform.h#60) to do that exactly.

### Proposed Solution
Add a method to call `spellcheck_platform::CheckSpelling` like so:

```cc
#if BUILDFLAG(USE_BROWSER_SPELLCHECKER)
bool Session::CheckSpelling(const std::string& word) {
  if (spellcheck::UseBrowserSpellChecker()) {
    return spellcheck_platform::CheckSpelling(base::UTF8ToUTF16(word), 0);
  }
  return true;
}
#endif
```

in `shell/browser/api/atom_api_session.cc`.

It's simple and won't affect other features.

### Alternatives Considered
I don't know.

### Additional Information
None

Thanks!
shell/renderer/api/electron_api_web_frame.cc
v8::Local<v8::Value> window,
                           const std::string& language,
                           v8::Local<v8::Object> provider) {
  auto context = args->isolate()->GetCurrentContext();
  if (!provider->Has(context, gin::StringToV8(args->isolate(), "spellCheck"))
           .ToChecked()) {
    args->ThrowError("\"spellCheck\" has to be defined");
    return;
  }
  
  content::RenderFrame* render_frame = GetRenderFrame(window);
  if (!render_frame) {
    args->ThrowError(
        "Render frame was torn down before webFrame.setSpellCheckProvider "
        "could be executed");
    return;
  }
  auto* existing = SpellCheckerHolder::FromRenderFrame(render_frame);
  if (existing)
    existing->UnsetAndDestroy();
  
  
  auto spell_check_client =
      std::make_unique<SpellCheckClient>(language, args->isolate(), provider);
  FrameSetSpellChecker spell_checker(spell_check_client.get(), render_frame);
  
  new SpellCheckerHolder(render_frame, std::move(spell_check_client));
}
void InsertText(gin_helper::ErrorThrower thrower,