builds cmd refactor (#975)

- Bugfix: `builds download` partial-block fetch decisions now account for build storage host latency
- Bugfix: Transfer rate displays in `builds` commands now smooth correctly
- Split `buildstorageoperations.cpp` (8.5k lines) into per-operation TUs: buildinspect, buildprimecache, buildstorageresolve, buildupdatefolder, builduploadfolder, buildvalidatebuildpart; stats moved to buildstoragestats.h.
- FilteredRate extracted to zenutil.
- BuildsCommand shared state consolidated into a BuildsConfiguration struct; subcommands inherit from BuildsSubCmdBase holding a `const BuildsConfiguration&` instead of a `BuildsCommand&`.
- `ProgressBar` renamed to `ConsoleProgressBar`; mode enum (`ConsoleProgressMode`) lifted to namespace scope;  `PushLogOperation`/`PopLogOperation`/`ForceLinebreak` promoted to virtuals on `ProgressBase`.
- Free-function wrappers (`UploadFolder`, `DownloadFolder`, `ValidateBuildPart`) added around the existing operation classes so callers stop reimplementing setup + stats logging.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/zen/consoleprogress.h b/src/zen/consoleprogress.h
new file mode 100644
index 000000000..3b68f4ca5
--- /dev/null
+++ b/src/zen/consoleprogress.h
@@ -0,0 +1,19 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include <zenutil/progress.h>
+
+namespace zen {
+
+enum class ConsoleProgressMode
+{
+	Plain,
+	Pretty,
+	Log,
+	Quiet
+};
+
+ProgressBase* CreateConsoleProgress(ConsoleProgressMode InMode);
+
+}  // namespace zen