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Description of problem:
Currently it seems to me there's no way to get the package vendor through the dnf API. To provide feature parity of both yum and dnf, please add a vendor property to the Package class (https://dnf.readthedocs.io/en/latest/api_package.html#dnf.package.Package). In yum, it is available in the RPMInstalledPackage class.

Version-Release number of selected component (if applicable):
dnf-0:4.2.17-6.el8.noarch
rpm-0:4.14.2-37.el8.x86_64

Steps to Reproduce:
RHEL 7.8:
```
import yum
yum_base = yum.YumBase()
print(yum_base.rpmdb.returnPackages()[0].vendor)
```
Output: 'Red Hat, Inc.'

RHEL 8.2
```
import dnf
dnf_base = dnf.Base()
dnf_base.fill_sack(load_system_repo=True, load_available_repos=False)
dnf_base.sack.query().installed()[0].vendor
```
Output: Traceback "AttributeError: 'Package' object has no attribute 'vendor'"

Actual results:
I'm unable to get the vendor of a package through the dnf python module.

Expected results:
I have a way to get the vendor of a package through the dnf python API.

As a workaround, in Convert2RHEL we started printing a packager instead of a vendor of a package. However, Oracle Linux packages have the packager field empty. They have just the vendor field filled in ("Oracle America"). Because of that, the output of Convert2RHEL is quite confusing:
```
WARNING - The following packages will be removed...
Package Packager Repository
------- -------- ----------
oraclelinux-release-8:8.2-1.0.8.el8.x86_64 N/A N/A
```

I made two PRs to address the issue.

dnf: https://github.com/rpm-software-management/dnf/pull/1677
libdnf: https://github.com/rpm-software-management/libdnf/pull/1073

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (dnf bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1657