[cli-tests] Add tests that use --trace-file-stat

Basic tests for (de)compressing in the following modes:
* file to file
* file to stdout
* stdin to file
* stdin to stdout

These are basic tests, and aren't testing more advanced scenarios, but
it adds the groundwork for more complex tests as needed.

Fixes #3010.

tests/cli-tests/file-stat/compress-file-to-file.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+set -e
+
+datagen > file
+
+zstd file -q --trace-file-stat -o file.zst
+zstd -tq file.zst