gh-75955: tarfile: Allow configuring the record size #129260
                
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Allow configuring the record size of a tarfile from the default of 20, as requested in #75955, by adding a new optional parameter blocking_factor to
tarfile.TarFile. This matches the--blocking-factorparameter supported by GNU tar.The
blocking_factoris only used to influence the padding when writing to an archive, just as the previously hard coded blocking factor of 20.📚 Documentation preview 📚: https://cpython-previews--129260.org.readthedocs.build/