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.

cdc_rsync_cli/BUILD

@@ -0,0 +1,44 @@
+package(default_visibility = [
+    "//:__subpackages__",
+])
+
+cc_binary(
+    name = "cdc_rsync",
+    srcs = ["main.cc"],
+    deps = [
+        ":params",
+        "//cdc_rsync",
+    ],
+)
+
+cc_library(
+    name = "params",
+    srcs = ["params.cc"],
+    hdrs = ["params.h"],
+    deps = [
+        "//cdc_rsync",
+        "@com_github_zstd//:zstd",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+cc_test(
+    name = "params_test",
+    srcs = ["params_test.cc"],
+    data = ["testdata/root.txt"] + glob(["testdata/params/**"]),
+    deps = [
+        ":params",
+        "//common:test_main",
+        "@com_google_googletest//:gtest",
+    ],
+)
+
+filegroup(
+    name = "all_test_sources",
+    srcs = glob(["*_test.cc"]),
+)
+
+filegroup(
+    name = "all_test_data",
+    srcs = glob(["testdata/**"]),
+)