feat: add support for `mode="x"` in `py7zr.SevenZipFile()` #1707

Job	Run time
Test Python 3.8 on ubuntu-22.04	1m 27s
Test slow test cases	54s
Test on aarch64	8m 11s
Test Python 3.9 on ubuntu-22.04	2m 6s
Test Python 3.10 on ubuntu-22.04	58s
Test Python 3.11 on ubuntu-22.04	55s
Test Python 3.12 on ubuntu-22.04	1m 47s
Test Python pypy-3.9 on ubuntu-22.04	2m 3s
Test Python 3.8 on windows-latest	2m 6s
Test Python 3.9 on windows-latest	2m 12s
Test Python 3.10 on windows-latest	2m 7s
Test Python 3.11 on windows-latest	2m 8s
Test Python 3.12 on windows-latest	2m 8s
Test Python 3.11 on macos-latest	1m 0s
finish parallel build	0s
	30m 2s

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