Fix OSS build

Summary:
- Add magic_enum manifest & add it as a dependency to cachelib
- Fix folly exception tracer library names and add magic_enum library to cachelib_common target
- Add folly::Subprocess dependency in benchmark targets
- Fix compiler error in cachebench/binary_trace_gen.cpp
- Add in AggregateStats.cpp to cachebench CMakeLists

Reviewed By: pbhandar2

Differential Revision: D92866330

fbshipit-source-id: 855a0bbbb3380b46496971b50dfb60ae81230a60

Author: rlyerly

build/fbcode_builder/manifests/cachelib

@@ -25,6 +25,7 @@ zstd
 mvfst
 numa
 libaio
+magic_enum
 # cachelib also depends on openssl but since the latter requires a platform-
 # specific configuration we rely on the folly manifest to provide this
 # dependency to avoid duplication.

build/fbcode_builder/manifests/magic_enum

@@ -0,0 +1,14 @@
+[manifest]
+name = magic_enum
+
+[download]
+url = https://github.com/Neargye/magic_enum/releases/download/v0.9.7/magic_enum-v0.9.7.tar.gz
+sha256 = c047bc7ca0b76752168140e7ae9a4a30d72bf6530c196fdfbf5105a39d40cc46
+
+[build]
+builder = cmake
+
+[cmake.defines]
+MAGIC_ENUM_OPT_BUILD_EXAMPLES = OFF
+MAGIC_ENUM_OPT_BUILD_TESTS = OFF
+MAGIC_ENUM_OPT_INSTALL = ON