wp: implement topics in SPA log interface

Implement SPA log topic API, showing log topics as GLIB_DOMAIN,
and enabling based on WIREPLUMBER_DEBUG.
6 jobs for log-topic in 2 minutes and 56 seconds (queued for 1 second)
Status Name Job ID Coverage
  Container
passed container_fedora #14752069

00:00:34

passed container_ubuntu #14752070

00:00:44

 
  Build
passed build_on_fedora_no_docs #14752072

00:01:02

passed build_on_fedora_with_docs #14752071

00:01:19

passed build_on_ubuntu_no_gir #14752074

00:01:06

passed build_on_ubuntu_with_gir #14752073

00:00:59