[Feature Request]: Support LZMA compression in python I/O SDKs

[wrossmorrow]

What would you like to happen?

LZMA compression is standard in python but not one of the strategies in the beam.io.{Read,Write}FromText PTransforms. openwebtext, for example, uses this compression. I think this may be a pretty simple change. For example, I hacked up a naive "shim" here for use in Dataflow with a custom container by just overwriting apache_beam/io/filesystem.py in the site-packages. It's working (a) locally with decompression and compression (though the output filenames are malformed, the part schema follows the compression extension) and (b) in a DataflowRunner reading a GCS dump of all the openwebtext .xz archives. (Without this I've been having a hell of a time getting any horizontal scaling while reading openwebtext.) It may be this simple, but I haven't run any Beam tests on these minor changes. I will probably do a bit more research into that myself.

Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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[wrossmorrow]

Merged in #25317