[Rpm-maint] [rpm-software-management/rpm] RPM with Copy on Write (#1470)

[malmond77]

@cgwalters Thanks for the detailed feedback! You're right: support for both paths is critical. I've tried to minimize changes to the original code. The default path is still the non-cow method. The only way to enable this is to 1) install `python3-plugin-dnf-cow` to instruct `librepo` to transcode during downloads and 2) install the optional plugin package to intercept the file creation/write step. Actually deciding whether to do these depends on both the filesystem support *and* an an appropriate partition layout. Systems that split the root filesystem up will likely not benefit, so I like the idea of making that decision within Anaconda.

On a side note: I am still working on this - I have been dealing with non CoW related topics for the past few months. I remain committed to addressing the feedback given to the best of my ability so this is acceptable and mergeable in the future.

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