[WIP] Add java.net.HttpURLConnection to JavaNet

[marcprux]

java.net.HttpURLConnection is very useful because it provides access to the Android-native HTTP connection handling APIs.

Leaving as draft for discussion.

[ktoso]

Yeah that’s a good one, agreed.

are we missing much of its api surface though or did it import all we need already? (What other types do we need to add)

[marcprux]

are we missing much of its api surface though or did it import all we need already? (What other types do we need to add)

I think we have almost everything we need. The Java 8 docs for HttpURLConnection only reference InputStream, which I think it already there. The only other one is java.security.Permission, which doesn't do anything on Android (or anywhere else we are likely to be targeting, I expect).

[ktoso]

Yeah Permissions isn't too exciting I guess AFAIK? We're missing getHeaderFields which might be a nice one to have, I'll follow up on it here.

[ktoso]

Meh, this reminds me we should make wrap-java more repeatable, it causes a huge diff now due to unordered member rendering in generated sources... I'll get this landed, thanks for the idea @marcprux !

[ktoso]

I'll merge this and follow up with regeneration and some CI changes