Move `systemd-tmpfiles` and `dracut.conf.d` configurations to this repository if possible

[tulilirockz]

There seem to be quite a few specific tmpfiles and dracut configurations on the fedora-bootc repository that ideally should be here instead so that other distributions can package these fixes along with bootc itself. Bootcrew is directly writing these on the Containerfiles but there are many other fixes that are implemented on the fedora-bootc and centos-bootc images that are not caught by my manual reviewing process, would be great to have something upstream that others can point to instead of manually creating these files on each package. Some of these aren't applicable for every system but things like always adding bootc and ostree to dracut.conf.d would be quite handy.

Specifics

/usr/lib/dracut/dracut.conf.d/20-bootc-base.conf
/usr/lib/dracut/dracut.conf.d/22-bootc-generic.conf
/usr/lib/dracut/dracut.conf.d/30-bootc-standard.conf
/usr/lib/dracut/dracut.conf.d/49-bootc-tpm2-tss.conf
/usr/lib/tmpfiles.d/bootc-base-rpmstate.conf
/usr/lib/tmpfiles.d/rpm-ostree-0-integration-opt-usrlocal.conf
/usr/lib/tmpfiles.d/rpm-ostree-0-integration.conf
/usr/lib/tmpfiles.d/rpm-ostree-autovar.conf

[cgwalters]

We do have https://github.com/bootc-dev/bootc/tree/main/baseimage for some bits. (Though note the ostree one doesn't matter with the composefs backend - also this one relates to #1770 in that if we build ostree as a bundled dep here we can unconditionally set it to use the composefs backend)