Revert "gh-133390: Support SQL keyword completion for sqlite3 CLI (#133393)" temporarily (GH-135232)

This reverts commit 62b3d2d443,
which broke buildbots

Lib/sqlite3/_completer.py

@@ -1,42 +0,0 @@
-from contextlib import contextmanager
-
-try:
-    from _sqlite3 import SQLITE_KEYWORDS
-except ImportError:
-    SQLITE_KEYWORDS = ()
-
-_completion_matches = []
-
-
-def _complete(text, state):
-    global _completion_matches
-
-    if state == 0:
-        text_upper = text.upper()
-        _completion_matches = [c for c in SQLITE_KEYWORDS if c.startswith(text_upper)]
-    try:
-        return _completion_matches[state] + " "
-    except IndexError:
-        return None
-
-
-@contextmanager
-def completer():
-    try:
-        import readline
-    except ImportError:
-        yield
-        return
-
-    old_completer = readline.get_completer()
-    try:
-        readline.set_completer(_complete)
-        if readline.backend == "editline":
-            # libedit uses "^I" instead of "tab"
-            command_string = "bind ^I rl_complete"
-        else:
-            command_string = "tab: complete"
-        readline.parse_and_bind(command_string)
-        yield
-    finally:
-        readline.set_completer(old_completer)