Add getProfilePictureURI method for the Profile module

[leolusoli]

Related to the discussion of Limited Login and Profile PR.
It'll be great to have a separate method of the Profile module that can create the profile picture uri passing some parameters according to the various options that the SDK provides (i.e. width and height parameters)

Complete discussion here: https://github.com/thebergamo/react-native-fbsdk-next/pull/18#discussion_r621306439

Thanks in advice :)

[kapir]

I tried looking into this, but could not see that their actually are possibilities for this with the limited login, as using the graph api is not possible. It seems that the underlying functionality in the IOS sdk also uses accessTokens.

https://github.com/facebook/facebook-ios-sdk/blob/81305eb2cd6df2ac4c63102041c7fe7c9f25df97/FBSDKCoreKit/FBSDKCoreKit/Profile%2BImageURL.swift#L55