commands: add "version_info" cmd

example:
```
$ ./run_electrum -o version_info
{
    "aiohttp.version": "3.8.1",
    "aiorpcx.version": "0.22.1",
    "certifi.version": "2021.10.08",
    "cryptodome.version": null,
    "cryptography.path": "/home/user/.local/lib/python3.8/site-packages/cryptography",
    "cryptography.version": "3.4.6",
    "dnspython.version": "2.2.0",
    "electrum.path": "/home/user/wspace/electrum/electrum",
    "electrum.version": "4.2.1",
    "hidapi.version": "0.11.0.post2",
    "libsecp256k1.path": "/home/user/wspace/electrum/electrum/libsecp256k1.so.0",
    "libusb.path": "libusb-1.0.so",
    "libusb.version": "1.0.23.11397",
    "libzbar.path": "/home/user/wspace/electrum/electrum/libzbar.so.0",
    "pyaes.version": "1.3.0",
    "pyqt.path": "/usr/lib/python3/dist-packages/PyQt5",
    "pyqt.version": "5.14.1",
    "qt.version": "5.12.8"
}
```

electrum/plugin.py

@@ -29,7 +29,7 @@ import time
 import threading
 import sys
 from typing import (NamedTuple, Any, Union, TYPE_CHECKING, Optional, Tuple,
-                    Dict, Iterable, List, Sequence, Callable, TypeVar)
+                    Dict, Iterable, List, Sequence, Callable, TypeVar, Mapping)
 import concurrent
 from concurrent import futures
 from functools import wraps, partial
@@ -749,3 +749,25 @@ class DeviceMgr(ThreadJob):
                 client.handler.update_status(False)
 
         return devices
+
+    @classmethod
+    def version_info(cls) -> Mapping[str, Optional[str]]:
+        ret = {}
+        # add libusb
+        try:
+            import usb1
+        except Exception as e:
+            ret["libusb.version"] = None
+        else:
+            ret["libusb.version"] = ".".join(map(str, usb1.getVersion()[:4]))
+            try:
+                ret["libusb.path"] = usb1.libusb1.libusb._name
+            except AttributeError:
+                ret["libusb.path"] = None
+        # add hidapi
+        from importlib.metadata import version
+        try:
+            ret["hidapi.version"] = version("hidapi")
+        except ImportError:
+            ret["hidapi.version"] = None
+        return ret