A more informative healthcheck

[neo451]

Compare the current healthcheck with the old Obsidian debug command:

1. removed the buf_dir display
2. removed the completion sources, since there's not much bugs on completion and we will remove completion one day.

But some lacking stuff:

• Obsidian PasteImg doesn't work #254 signifies that we are not checking optional dependencies, like wsl-open, and wl-clipboard, so users will get confused if they pass healthcheck but still can not use properly. feat: check additional os specific dependencies #259
• can also show the result of Obsidian check?
• print a clean list of workspaces.
• print some sub module options, like which ones are enabled, template dir, daily note dir and etc.