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
int world_id,
                          const gin_helper::Dictionary& options,
                          gin_helper::Arguments* args) {
  auto* render_frame = GetRenderFrame(window);
  if (!render_frame) {
    args->ThrowError(
        "Render frame was torn down before webFrame.setIsolatedWorldInfo could "
        "be executed");
    return;
  }
  std::string origin_url, security_policy, name;
  options.Get("securityOrigin", &origin_url);
  options.Get("csp", &security_policy);
  options.Get("name", &name);
  if (!security_policy.empty() && origin_url.empty()) {
    args->ThrowError(
        "If csp is specified, securityOrigin should also be specified");
    return;
  }
  blink::WebIsolatedWorldInfo info;
  info.security_origin = blink::WebSecurityOrigin::CreateFromString(
      blink::WebString::FromUTF8(origin_url));
  info.content_security_policy = blink::WebString::FromUTF8(security_policy);
  info.human_readable_name = blink::WebString::FromUTF8(name);
  blink::SetIsolatedWorldInfo(world_id, info);
}
blink::WebCacheResourceTypeStats GetResourceUsage(v8::Isolate* isolate) {