getCognitoUserSession method
This is used to build a user session from tokens retrieved in the authentication result
Implementation
CognitoUserSession getCognitoUserSession(Map<String, dynamic> authResult) {
final idToken = CognitoIdToken(authResult['IdToken']);
final accessToken = CognitoAccessToken(authResult['AccessToken']);
final refreshToken = CognitoRefreshToken(authResult['RefreshToken']);
return CognitoUserSession(idToken, accessToken, refreshToken: refreshToken);
}