feat: allow dynamic note management

[dunix241]

A note can now have a global or project local scope and can be created dynamically without having to predefine it.

Create a note

require('global-note').create_note({local_scope})

or

-- :GlobalNoteCreate <scope>

Toggle a note

require('global-note').toggle_note(preset_name, local_scope)

or

-- :GlobalNote <preset_name> <scope>

Pick a note

require('global-note').pick_note({local_scope})

-- :GlobalNotePick <scope>

Please refer to the documentation for more information.