Output python version and implementation as part of --version flag (#…

…2997)

Example:

black, 22.1.1.dev56+g421383d.d20220405 (compiled: no)
Python (CPython) 3.9.12

Co-authored-by: Batuhan Taskaya <isidentical@gmail.com>

CHANGES.md

@@ -37,6 +37,8 @@
 
 <!-- Changes to Black's terminal output and error messages -->
 
+- Output python version and implementation as part of `--version` flag (#2997)
+
 ### Packaging
 
 <!-- Changes to how Black is packaged, such as dependency requirements -->

src/black/__init__.py

@@ -10,6 +10,7 @@
 import os
 from pathlib import Path
 from pathspec.patterns.gitwildmatch import GitWildMatchPatternError
+import platform
 import re
 import signal
 import sys
@@ -381,7 +382,10 @@ def validate_regex(
 )
 @click.version_option(
     version=__version__,
-    message=f"%(prog)s, %(version)s (compiled: {'yes' if COMPILED else 'no'})",
+    message=(
+        f"%(prog)s, %(version)s (compiled: {'yes' if COMPILED else 'no'})\n"
+        f"Python ({platform.python_implementation()}) {platform.python_version()}"
+    ),
 )
 @click.argument(
     "src",