"conan upload" should print package page URL to console when finished

[annulen]

That would allow to verify uploading result immediately, without waiting package to be indexed by search

[memsharded]

Not a bad idea, can make sense for conan.io, but for in-house conan_server? Maybe custom message depending on remote? Have to think about it.

[memsharded]

Note: Not only in success cases, but most important: in error scenarios. As reported by @tru:

I think that the most frustrating thing was that the client's error diagnostic just came down to "error uploading" and nothing extra. I think printing the URL it tried for uploading should have been logged or something similar like that. I am hoping that this can be improved.