gh-121402: Fix ZipFile.open() to set current time by default, add .newfile() #121405
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…dd .newfile() to keep compression
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When streaming, writing data to a zip file, it sets a timestamp of 1980. I believe this is never the intention so here's a fix to use the current time.
See issue #121402 for details, so this is my suggestion...
I'm also adding a newfile() method that returns a ZipInfo object which inherits the previously configured compression so that the user can pass that object to open() without having to remember to set the compression and _compresslevel/compresslevel atributes again (otherwise the previously set compression is ignored and the added file is written uncompressed). This is for creating new archives.