saber: Add package

[Kiri2002]

tested in extra-x86_64 with depend "fvm" (#3727), namcap is:

saber E: ELF file ('usr/share/saber/saber') outside of a valid path.
saber W: ELF file ('usr/lib/saber/libapp.so') lacks FULL RELRO, check LDFLAGS.
saber W: ELF file ('usr/lib/saber/libapp.so') lacks GNU_PROPERTY_X86_FEATURE_1_SHSTK.
saber W: ELF file ('usr/lib/saber/libflutter_linux_gtk.so') lacks GNU_PROPERTY_X86_FEATURE_1_SHSTK.
saber W: ELF file ('usr/lib/saber/libpdfium.so') lacks GNU_PROPERTY_X86_FEATURE_1_SHSTK.
saber W: ELF file ('usr/lib/saber/libsuper_native_extensions.so') lacks GNU_PROPERTY_X86_FEATURE_1_SHSTK.
saber W: Referenced library 'libyaru_window_linux_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'libdynamic_color_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'libwindow_manager_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'libsuper_native_extensions_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'liburl_launcher_linux_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'libscreen_retriever_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'libgtk_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'libprinting_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'libflutter_linux_gtk.so' is an uninstalled dependency (needed in files ['usr/lib/saber/libscreen_retriever_plugin.so', 'usr/lib/saber/libgtk_plugin.so', 'usr/lib/saber/libyaru_window_linux_plugin.so', 'usr/lib/saber/libdynamic_color_plugin.so', 'usr/lib/saber/libirondash_engine_context_plugin.so', 'usr/share/saber/saber', 'usr/lib/saber/libflutter_secure_storage_linux_plugin.so', 'usr/lib/saber/libwindow_manager_plugin.so', 'usr/lib/saber/liburl_launcher_linux_plugin.so'])
saber W: Referenced library 'libirondash_engine_context_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Referenced library 'libflutter_secure_storage_linux_plugin.so' is an uninstalled dependency (needed in files ['usr/share/saber/saber'])
saber W: Unused shared library '/usr/lib/libdl.so.2' by file ('usr/lib/saber/libflutter_linux_gtk.so')
saber W: Unused shared library '/usr/lib/libpthread.so.0' by file ('usr/lib/saber/libflutter_linux_gtk.so')
saber W: Unused shared library '/usr/lib/libpthread.so.0' by file ('usr/lib/saber/libpdfium.so')
saber W: Unused shared library '/usr/lib/libpthread.so.0' by file ('usr/lib/saber/libsuper_native_extensions.so')
saber W: Unused shared library '/usr/lib/libdl.so.2' by file ('usr/lib/saber/libsuper_native_extensions.so')
saber W: Dependency hicolor-icon-theme detected and implicitly satisfied (needed for hicolor theme hierarchy)

Meet same issue and using same way to solve runpath as #3728