Move okhttp client from http-api

The client has been recreated with a new builder off of the http-api
client for awhile anyway since runelite-client has multiple other
requirements (caching, tls, etc). This fully moves creation of the
okhttp client into both http-service and runelite-client separately.

I've kept the CLIENT field in http-api for now since a few external
plugins depend on it currently.

runelite-client/src/main/resources/net/runelite/client/runelite.properties

@@ -1,5 +1,7 @@
 runelite.title=RuneLite
 runelite.version=${project.version}
+runelite.commit=${git.commit.id.abbrev}
+runelite.dirty=${git.dirty}
 runelite.discord.appid=409416265891971072
 runelite.discord.invite=https://discord.gg/ArdAhnN
 runelite.github.link=https://github.com/runelite