[Input method frame] add selinux support

[xingwozhonghua126]

There are few attempts to make SELinux for applications, and the average user program has its own context for dbus/xserver/container.

So hope that the parties (input method framework and input method engine) discuss how to build application-level selinux

wiki:
https://github.com/SELinuxProject/selinux-notebook/blob/main/src/toc.md
wiki2:
https://selinuxproject.org/page/ObjectClassesPerms#key
selinux rep:
https://github.com/TresysTechnology/refpolicy
selinux debian:
https://salsa.debian.org/selinux-team/refpolicy
selinux fedora:
https://src.fedoraproject.org/rpms/selinux-policy/tree/rawhide