core(minor): Add a way to print out system information for debugging purposes. (#15718)

To use: 

```bash
python -m langchain_core.sys_info
```

libs/core/tests/unit_tests/test_sys_info.py

@@ -0,0 +1,6 @@
+from langchain_core.sys_info import print_sys_info
+
+
+def test_print_sys_info() -> None:
+    """Super simple test to that no exceptions are triggered when calling code."""
+    print_sys_info()