Port to GTK4

Still very much WIP. Opening a MR to get suggestions/help with the process.

Will also try to accommodate #274 by the time its complete.

TODO:

• Compile
• Launch
• Move from libhandy to libadwaita
• Update depreciated APIs
  • gtk_entry_{get,set}_text
  • gtk_widget_{show,hide}
  • gtk_box_pack_start
  • gtk_window_hide
  • gtk_dialog_run
  • ...
• Update depreciated widgets
  • GtkFileDialog
  • GtkDialog
  • ...
• Port everything to GtkBuilder templates.
  • GduAtaSmartDialog
  • GduBenchmarkDialog
  • GduCreateDiskImageDialog
  • GduDiskSettingsDialog
  • ...
• Restore functionality
  • Delete Partition
  • Create Partition
  • Unmount
  • ...
• Label each partition with colors
• Custom disk usage bar

More Tasks: #274 (comment 1945849)

Although the PR is still a draft, Please keep reviewing it in parallel so i can fix the issues while working on it.