modification for flutter web auth 0.4.0

[Silfalion]

These modifications allow taking advantage of flutter_web_auth new features for flutter web which is to open a new tab for authentication instead of using the in-use one.

This pull request includes:

• bumping flutter web auth version to 0.4.0.
• adding the cookijar variable as well as imports in client_browser.dart.
• implementing web_auth in client_browser.dart.
• removing the condition at the end of the createOAuth2Session method in account.dart.

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[lohanidamodar]

Hey thank you for the PR,
Let's handle these changes 🙏🏻

[lohanidamodar]

Also seems there is some conflict, please sync with master and fix it

[Silfalion]

Hey thank you for the PR,
Let's handle these changes 🙏🏻

My pleasure.

Fixed the remaining conflicts for the pubspec.yaml file but the remaining one is about flutter_web_auth bump to 0.4.0

[lohanidamodar]

@Silfalion just removed some extra white spaces, and updated path_provider. Will let the tests pass and then merge.

[Silfalion]

@lohanidamodar awesome, thank you!