Releasing the former Stadia file transfer tools

The tools allow efficient and fast synchronization of large directory
trees from a Windows workstation to a Linux target machine.

cdc_rsync* support efficient copy of files by using content-defined
chunking (CDC) to identify chunks within files that can be reused.

asset_stream_manager + cdc_fuse_fs support efficient streaming of a
local directory to a remote virtual file system based on FUSE. It also
employs CDC to identify and reuse unchanged data chunks.

third_party/dirent/BUILD.bazel

@@ -0,0 +1,15 @@
+# Description:
+# This project provides Linux compatible Dirent interface for Microsoft Windows.
+#
+
+licenses(["notice"])  # MIT license
+
+exports_files(["LICENSE"])
+
+package(default_visibility = ["//visibility:public"])
+
+cc_library(
+    name = "dirent",
+    hdrs = ["include/dirent.h"],
+    includes = ["include"],
+)