feat: add synchronous check support for installed apps

[nelyousfi]

Why:

Adding a synchronous method to check installed apps on the device. This allows immediate access to the installed apps' status without managing asynchronous states. This is particularly useful in scenarios where showing a loading state would disrupt the UX, such as when populating a share sheets modal with only the installed apps.

How:

• Introduced a new synchronous function checkInstalledAppsSync that mirrors the functionality of the existing async checkInstalledApps.
• Both functions accept an array of package names (for Android) or URL schemes (for iOS) and return a Record mapping each identifier to a boolean indicating installation status
• The sync implementation can be used directly in component render logic, as demonstrated in the example app where it's used for initial state:

const [result, setResult] = useState(checkInstalledAppsSync(packageNames));

[nelyousfi]

@EndLess728 When you have some time, could you please take a look at this? Feel free to decline if you believe this is not the direction your library should take for any reason.

[EndLess728]

Thanks for the PR @nelyousfi . I will surely check it in free time.