Fixed main thread checker errors.

[MussaCharles]

This PR fixes the issue which can be reproduced by the following steps:

Product -> Scheme -> Edit Scheme -> Diagnostics -> Runtime API Checking
Then Check MainThreadChecker check checkbox as shown on the following screenshot below. Run the app The following main thread errors will be observed

Additionally, I have addressed one of the issue which might occur when using websiteDataStore.httpCookieStore, which requires to be used on the main thread,

To fix the issue, I simply Dispatched calls to websiteDataStore.httpCookieStore. to the main queue and dispatched a call to URLAuthenticationChallenge to the background thread. This effectively resolved the mentioned issues. Feel free to add or request any necessary changes before merging thanks :)