[Rpm-maint] [rpm-software-management/rpm] Create content handler plugin hook (PR #2416)

[Richard Phibel]

### Description
This change creates a new `content_handler` plugin hook. This hook can be used by plugins to claim responsability for the package payload. The plugin will then be responsible for:
- reading the payload
- verifying it
- installing the files

The main motivation for this change is to enable features like [RPMCoW](https://fedoraproject.org/wiki/Changes/RPMCoW) where the package payload is not in a `cpio` format.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/2416

-- Commit Summary --

  * Create content handler plugin hook

-- File Changes --

    M include/rpm/rpmte.h (62)
    M include/rpm/rpmts.h (12)
    M include/rpm/rpmtypes.h (10)
    M lib/depends.c (16)
    M lib/fsm.c (101)
    M lib/fsm.h (14)
    M lib/rpmplugin.h (12)
    M lib/rpmplugins.c (28)
    M lib/rpmplugins.h (9)
    M lib/rpmte.c (38)
    M lib/transaction.c (34)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/2416.patch
https://github.com/rpm-software-management/rpm/pull/2416.diff

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