feat: add custom events for web packages

[fadi-george]

https://linear.app/onesignal/issue/SDK-2946/add-custom-events-for-onesignal-web-shim-package

• Exposes custom event methods (trackEvent) for vue2, vue3, angular, and react.
• Updates template gen to handle Promise and Promise
• Adds tsc checks for react package (vite build ignores ts errors)
• Updates templates to change outputs of certain methods from:

function pushSubscriptionOptIn(): Promise<void> {
  return new Promise(function (resolve, reject) {
    if (isOneSignalScriptFailed) {
      reject(new Error('OneSignal script failed to load.'));
      return;
    }

    try {
      window.OneSignalDeferred?.push((OneSignal) => {
        OneSignal.User.PushSubscription.optIn().then(() => resolve())
          .catch(error => reject(error));
      });
    } catch (error) {
      reject(error);
    }
  });
}

to:
(removed unnecessary try atch)

function pushSubscriptionOptIn(): Promise<void> {
  return new Promise((resolve, reject) => {
    if (isOneSignalScriptFailed) {
      reject(new Error('OneSignal script failed to load.'));
      return;
    }

    window.OneSignalDeferred?.push((OneSignal) => {
      OneSignal.User.PushSubscription.optIn()
        .then(() => resolve())
        .catch(error => reject(error));
    });
  });
}

And fixes functions like request permission (which was Promise but now is Promise due to api json changes)
Before:

function notificationsRequestPermission(): Promise<boolean> {
  return new Promise(function (resolve, reject) {
    if (isOneSignalScriptFailed) {
      reject(new Error('OneSignal script failed to load.'));
      return;
    }

    try {
      window.OneSignalDeferred?.push((OneSignal) => {
        resolve(OneSignal.Notifications.requestPermission())
          .catch(error => reject(error));
      });
    } catch (error) {
      reject(error);
    }
  });
}

to

function notificationsRequestPermission(): Promise<boolean> {
  return new Promise((resolve, reject) => {
    if (isOneSignalScriptFailed) {
      reject(new Error('OneSignal script failed to load.'));
      return;
    }

    window.OneSignalDeferred?.push((OneSignal) => {
      OneSignal.Notifications.requestPermission()
        .then(result => resolve(result))
        .catch(error => reject(error));
    });
  });
}

[jkasten2]

Can keep this PR to just custom events, move the outputs folder removal to a different PR?