gh-156363: Use PEP 810 lazy imports for inspect and re in rlcompleter

Address review feedback: replace deferred in-function imports of
`inspect` and `re` with `lazy import` statements at the top of the
module, keeping them alongside the regular imports.

Author: maxday

Lib/rlcompleter.py

@@ -36,6 +36,9 @@
 import warnings
 import types
 
+lazy import inspect
+lazy import re
+
 __all__ = ["Completer"]
 
 # Sentinel object to distinguish "missing" from "present but None"
@@ -103,7 +106,6 @@ def complete(self, text, state):
 
     def _callable_postfix(self, val, word):
         if callable(val):
-            import inspect
             word += "("
             try:
                 if not inspect.signature(val).parameters:
@@ -152,7 +154,6 @@ def attr_matches(self, text):
         with a __getattr__ hook is evaluated.
 
         """
-        import re
         m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
         if not m:
             return []