Add method overloads in modules for methods with optional parameters

[henrikfroehling]

For example:

public Task<TraktResponse<ITraktShow>> ITraktShowsModule.GetShowAsync(
    string showIdOrSlug, TraktExtendedInfo extendedInfo = null,
    CancellationToken cancellationToken = default);

should be split up into

public Task<TraktResponse<ITraktShow>> ITraktShowsModule.GetShowAsync(
    string showIdOrSlug, CancellationToken cancellationToken = default);

and

public Task<TraktResponse<ITraktShow>> ITraktShowsModule.GetShowAsync(
    string showIdOrSlug, TraktExtendedInfo extendedInfo,
    CancellationToken cancellationToken = default);