[gnome-software] (20 commits) ...Merge branch 'refactor-threads24' into 'main'

[Milan Crha <mcrha src gnome org>]

Summary of changes:

  67c7178... lib: Factor out some common sort functions for apps
  9fec0ee... gs-app-query: Add a keywords property
  f0965d7... appstream: Port gs_plugin_add_search() vfunc to GsPluginJob
  6a15245... dummy: Port gs_plugin_add_search() vfunc to GsPluginJobList
  8982649... flatpak: Port gs_plugin_add_search() vfunc to GsPluginJobLi
  e8db661... snap: Port gs_plugin_add_search() vfunc to GsPluginJobListA
  e919aaa... snap: Fix listing apps to use sections correctly
  e8f78a0... doc: Port gs_plugin_add_search() vfunc to GsPluginJobListAp
  45de85f... gs-cmd: Port ACTION_SEARCH to use GsPluginJobListApps
  fd1150b... tests: Port ACTION_SEARCH to use GsPluginJobListApps
  78bcd3e... gs-application: Port ACTION_SEARCH to use GsPluginJobListAp
  8c67700... gs-search-page: Port ACTION_SEARCH to use GsPluginJobListAp
  dd5e765... gs-shell-search-provider: Port ACTION_SEARCH to use GsPlugi
  bfdce29... gs-plugin-job: Tweak gs_plugin_job_to_string() to always pr
  974241b... lib: Drop GS_PLUGIN_ACTION_SEARCH and gs_plugin_add_search(
  3729968... appstream: Comment on stemming approach for keyword searche
  9b22f3d... gs-plugin-loader: Drop use of AsPool
  0194200... lib: Drop support for plugin job timeouts
  b58f080... tests: Remove the test for invalid (too short) searches
  d11b8f5... Merge branch 'refactor-threads24' into 'main'