feat(fun/dt): Implement useful utility

fun/dt/CMakeLists.txt

@@ -0,0 +1,16 @@
+# -*- mode: cmake; -*-
+cmake_minimum_required(VERSION 3.16)
+project(dt)
+add_executable(dt dt.cc)
+find_package(absl REQUIRED)
+
+target_link_libraries(dt
+  absl::flags
+  absl::flags_parse
+  absl::hash
+  absl::time
+  absl::strings
+  farmhash
+)
+
+install(TARGETS dt DESTINATION bin)