plumb in LiveUpdate (WIP)

Each command that first checks preferred content (and/or required
content) and then does something that can change the sizes of
repositories needs to call prepareLiveUpdate, and plumb it through the
preferred content check and the location log update.

So far, only Command.Drop is done. Many other commands that don't need
to do this have been updated to keep working.

There may be some calls to NoLiveUpdate in places where that should be
done. All will need to be double checked.

Not currently in a compilable state.

Annex.hs

@@ -1,6 +1,6 @@
 {- git-annex monad
  -
- - Copyright 2010-2021 Joey Hess <id@joeyh.name>
+ - Copyright 2010-2024 Joey Hess <id@joeyh.name>
  -
  - Licensed under the GNU AGPL version 3 or higher.
  -}
@@ -79,6 +79,7 @@ import Types.RepoSize
 import Annex.VectorClock.Utility
 import Annex.Debug.Utility
 import qualified Database.Keys.Handle as Keys
+import Database.RepoSize.Handle
 import Utility.InodeCache
 import Utility.Url
 import Utility.ResourcePool
@@ -225,6 +226,7 @@ data AnnexState = AnnexState
 	, insmudgecleanfilter :: Bool
 	, getvectorclock :: IO CandidateVectorClock
 	, proxyremote :: Maybe (Either ClusterUUID (Types.Remote.RemoteA Annex))
+	, reposizehandle :: Maybe RepoSizeHandle
 	}
 
 newAnnexState :: GitConfig -> Git.Repo -> IO AnnexState
@@ -280,6 +282,7 @@ newAnnexState c r = do
 		, insmudgecleanfilter = False
 		, getvectorclock = vc
 		, proxyremote = Nothing
+		, reposizehandle = Nothing
 		}
 
 {- Makes an Annex state object for the specified git repo.