Fifth cl for verbose workspaces (ability to log certain potentially non-hermetic events that happen as part of repository rules).

* Allow to specify log file rather than dumping to INFO.
* Include a parser that is able to convert that binary file to text, optionally
filtering out specific rules.

In the future:
- Log levels, full or alerts only

RELNOTES: None
PiperOrigin-RevId: 210620591

src/BUILD

diff --git a/src/BUILD b/src/BUILD
index 50ec65e..c717547 100644
--- a/src/BUILD
+++ b/src/BUILD
@@ -350,6 +350,7 @@
         "//src/test/shell:srcs",
         "//src/tools/android/java/com/google/devtools/build/android:srcs",
         "//src/tools/execlog:srcs",
+        "//src/tools/workspacelog:srcs",
         "//src/tools/launcher:srcs",
         "//src/tools/package_printer/java/com/google/devtools/build/packageprinter:srcs",
         "//src/tools/skylark/java/com/google/devtools/skylark/skylint:srcs",