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

[chantra]

> As payload format is a per-package thing, this should be determined on rpmte level rather than per-file level

This is somehow what is being done here. In the psm_pre hook, reflink determine that the package is a transcoded one and is to be handled by itself. I understand this hook is at rpmte level.

> and the writing side needs to be something like rpm handing the plugin an open fd and the plugin placing the content there by whatever means

This is currently emulated by [providing an archive_reader hook](https://github.com/chantra/rpm/commit/1cc53396f73651a86f002b4db97d28329b85c176), that lets the plugin define how to iterate over each files (using header or content of payload). And then, for each entries, install of the files can be offloaded to the [plugin with the install_file hook](https://github.com/chantra/rpm/commit/ad46eb4132cbd2c4ee23686a1c52f2fc57afffc5). If nothing is performed by a plugin, it defaults to core RPM behaviour.

Does that somehow align? Any changes you like to see in how this is done? Shall I start a PR on top of https://github.com/rpm-software-management/rpm/pull/1909 with those new hooks? 




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