[Rpm-maint] [rpm-software-management/rpm] RPM with Copy on Write (PR #2378)

[Richard Phibel]

# Description
This is a refactoring of PR [#1470](https://github.com/rpm-software-management/rpm/pull/1470).
The RPM CoW plugin is refactored to register as owner of payloads transcoded by `rpm2extents` as suggested in comment [#2057](https://github.com/rpm-software-management/rpm/discussions/2057#discussioncomment-2897701).
# How it works
I defined 2 new fields of type `rpmPlugin` (with associated getters and setters) in `rpmte` structure:
- [`customArchiveReader`](https://github.com/rphibel/rpm/blob/8de078508954e005ba0c974389979070cfe9431d/lib/rpmte.c#L85)
- [`customFileInstaller`](https://github.com/rphibel/rpm/blob/8de078508954e005ba0c974389979070cfe9431d/lib/rpmte.c#L86)

When a plugin wants to register as an archive reader for a package, it sets the field `customArchiveReader` in the [`psm_pre` ](https://github.com/rphibel/rpm/blob/8de078508954e005ba0c974389979070cfe9431d/plugins/reflink.c#L165)stage.
Similarly, if it wants to register as a file installer it sets the `customFileInstaller` field.

Then in [`fsm.c`](https://github.com/rphibel/rpm/blob/8de078508954e005ba0c974389979070cfe9431d/lib/fsm.c#L849), if these fields are set, archive reading, file installation is deferred to the plugin.

You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/2378

-- Commit Summary --

  * RPM with Copy on Write
  * RPM with Copy on Write
  * RPM CoW: use registration model for plugin

-- File Changes --

    M CMakeLists.txt (5)
    M build/pack.c (2)
    M include/rpm/rpmcli.h (10)
    M include/rpm/rpmlib.h (9)
    M include/rpm/rpmpgp.h (9)
    M include/rpm/rpmte.h (30)
    M include/rpm/rpmtypes.h (3)
    M lib/CMakeLists.txt (1)
    M lib/fsm.c (138)
    M lib/package.c (36)
    M lib/rpmchecksig.c (116)
    A lib/rpmextents.c (110)
    A lib/rpmextents_internal.h (58)
    M lib/rpmlead.c (43)
    M lib/rpmlead.h (37)
    M lib/rpmplugin.h (9)
    M lib/rpmplugins.c (50)
    M lib/rpmplugins.h (18)
    M lib/rpmte.c (31)
    M lib/transaction.c (29)
    M macros.in (1)
    M plugins/CMakeLists.txt (1)
    A plugins/reflink.c (402)
    A rpm2extents.c (701)
    M rpmio/rpmpgp.c (10)
    M rpmio/rpmpgp_internal.c (18)
    M rpmio/rpmpgpval.h (18)
    M scripts/CMakeLists.txt (1)
    A scripts/rpm2extents_dump (94)
    M sign/rpmgensig.c (2)
    M tests/CMakeLists.txt (1)
    M tests/atlocal.in (22)
    A tests/rpm2extents.at (151)
    M tests/rpmtests.at (1)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/2378.patch
https://github.com/rpm-software-management/rpm/pull/2378.diff

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