gh-153731: Handle NUL and lone surrogate in sqlite3 CLI REPL

[tonghuaroot]

In the python -m sqlite3 REPL, complete_statement() raises ValueError
(embedded NUL) or UnicodeEncodeError (lone surrogate), neither of which is a
sqlite3.Error, so a single such input line crashed the shell. Catch these two
and print an error, keeping the REPL running like the other error paths.

• Issue: sqlite3 command-line interface crashes on a NUL byte or lone surrogate in an input line #153731