Add ApiOption overloads to methods on IStarredClient

[shiftkey]

As part of completing #760 a number of overloads need to be added to the client interfaces.

As an example, this has been added to IReleasesClientand IObservableReleasesClient.

The checklist for porting each method is:

• Add an overload for this method on IStarredClient with a new parameter ApiOptions
• Implement the new method on the class which implements IStarredClient
• Add an overload for this method on IObservableStarredClient with a new parameter ApiOptions
• Implement the new method on the class which implements IObservableStarredClient

This needs to be done for each of these methods:

• Task<IReadOnlyList<Repository>> GetAllForCurrent()
• Task<IReadOnlyList<Repository>> GetAllForCurrent(StarredRequest request)
• Task<IReadOnlyList<RepositoryStar>> GetAllForCurrentWithTimestamps()
• Task<IReadOnlyList<RepositoryStar>> GetAllForCurrentWithTimestamps(StarredRequest request)
• Task<IReadOnlyList<Repository>> GetAllForUser(String user)
• Task<IReadOnlyList<Repository>> GetAllForUser(String user, StarredRequest request)
• Task<IReadOnlyList<RepositoryStar>> GetAllForUserWithTimestamps(String user)
• Task<IReadOnlyList<RepositoryStar>> GetAllForUserWithTimestamps(String user, StarredRequest request)
• Task<IReadOnlyList<User>> GetAllStargazers(String owner, String name)
• Task<IReadOnlyList<UserStar>> GetAllStargazersWithTimestamps(String owner, String name)

[shiftkey]

This was fixed in #1336