chore: import upstream snapshot with attribution

cpp/symbols/ray_api_exported_symbols_linux.lds

@@ -0,0 +1,19 @@
+# This file defines the C++ symbols that need to be exported (aka ABI, application binary interface).
+# These symbols will be used by other libraries.
+# Note: This file is used for linux only, and should be kept in sync with `ray_api_exported_symbols.lds`.
+# Ray ABI is not finalized, the exact set of exported (C/C++) APIs is subject to change.
+VERSION_1.0 {
+    global:
+        # common
+        *[0-9]ray[0-9]*;
+        TaskExecutionHandler;
+        GetFunctionManager;
+        GetRemoteFunctions;
+        InitRayRuntime;
+        # If the symbols of absl::flags are hidden, and the users also use the absl::flags library,
+        # then the flags feature will bring issues, e.g. `ERROR: Unknown command line flag`.
+        *absl*;
+        FLAGS_*;
+    local:
+        *;
+};