sqlite3 command-line interface crashes on a NUL byte or lone surrogate in an input line

Bug description

The python -m sqlite3 interactive shell crashes with a traceback and exits
when an input line contains an embedded NUL byte, or a lone surrogate under a
surrogateescape stdin. sqlite3.complete_statement() raises ValueError
(embedded NUL) or UnicodeEncodeError (lone surrogate); neither is a
sqlite3.Error, so it escapes the REPL instead of being reported like an
ordinary error.

$ printf "SELECT '\0';\nSELECT 1;\n" | python -m sqlite3
sqlite> Traceback (most recent call last):
  ...
ValueError: embedded null character

The following SELECT 1; never runs. Invalid SQL and unknown dot-commands, by
contrast, print a clean error and keep the shell running.

CPython versions tested on

3.14, 3.15, 3.16

Operating systems tested on

macOS

Linked PRs

• gh-153732

首先，透過互動式 shell python -m sqlite3 執行回報的輸入，並檢查它如何呼叫 sqlite3.complete_statement()。當包含 NUL 位元組和孤立 surrogate 的輸入產生乾淨的錯誤，同時 shell 仍持續執行並處理後續陳述式時，即表示完成。