[92] progress without error

[amyoulton]

This PR adds in the ability for a request to have a postProcessing method. To implement it, I have done the following:

1. Added postProcess method to Netable request, that by default returns the FinalResource. This will now be the final method run through every request.
2. If the user adds a post process method to the request, something can be run before the FinalResource is returned.
3. I have added in a simple example to the Example project, where we have a Data Manager that stores a user. The GetUserRequest implements the postProcess method, where we send the user to the shared user object in the DataManager before returning the finalResource.
4. In Homeview, I added a print method to showcase this working.

Note: I also removed the target here for the old example. I think that was also done in the sendable ticket which hasn't been merged, but if not it's done here now! Whichever ticket is merged first, I will rebase the other, so it shouldn't matter.

[brendanlensink]

A couple suggestions/comments to think about

Also we should probably bump the library version since we're adding new functionality ✨

[brendanlensink]

Looks good, before merging don't forget to add a blurb to the README explaining intended use 🚀

[amyoulton]

@brendanlensink this is merged! You said you were going to do the tag and release stuff so just nudging about that! 👀