[3.11] gh-111942: Fix crashes in TextIOWrapper.reconfigure() (GH-111976)

[miss-islington]

• Fix crash when encoding is not string or None.
• Fix crash when both line_buffering and write_through raise exception
  when converted ti int.
• Add a number of tests for constructor and reconfigure() method
  with invalid arguments.
  (cherry picked from commit ee06fff)

Co-authored-by: Serhiy Storchaka storchaka@gmail.com

• Issue: TextIOWrapper.reconfigure() crashes if encoding is not string or None #111942

[vstinner]

test_io failed on Address Sanitizer job:

ERROR: test_constructor (test.test_io.CTextIOWrapperTest.test_constructor)
----------------------------------------------------------------------
UnicodeEncodeError: 'utf-8' codec can't encode character '\udcfe' in position 0: surrogates not allowed

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/runner/work/cpython/cpython/Lib/test/test_io.py", line 2631, in test_constructor
    t.__init__(b, encoding="utf-8", errors='\udcfe')
SystemError: <method 'readable' of '_io.BytesIO' objects> returned a result with an exception set

This PR should be backport to 3.11 with its fix. I will wait until #112089 is merged into 3.12.