Store options in ServiceProviderCache

[AndriySvyryd]

By storing the options object in the underlying dictionary with a custom comparer instead of just the hash code allows to correctly resolve hash collisions for different options.

[ajcvickers]

@AndriySvyryd Isn't this likely to cause a memory leak due to all the references that the options object may have?

[AndriySvyryd]

@ajcvickers The options object is already stored in the corresponding service provider, how would this be different?