holdings: add patterns support

[jma]

• Adds a new holding editor to support patterns (prediction) preview.
• Suppport tree types of holdings in the professionnal document detailed
  view.
  • standard: the add/edit button load the item editor.
  • electronic: no action is available. It replaces the use of the
    harvested property.
  • serial: the add/edit button load the holding editor.
• Makes the button in the document detailed view compliant with the last
  UI specifications.
  • Removes textes in the list.
  • Uses outline buttons.
  • Changes the color.
  • Replaces the dialog displayed when a ressource cannot be deleted by
    a popover.
• Code refactoring:
  • Adds code documentations.
  • Renames functions.
  • Moves the responsability to delete an element to the list components (i.e. holdings
    instead of holding).
  • Puts the ng-templates at the end of template files.
  • Adds _ prefix to the private properties.
  • Uses the new permissions route guards.
  • Renames Base-route.ts file to base-route.ts.

Co-Authored-by: Johnny Mariéthoz Johnny.Mariethoz@rero.ch

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• Which issue does it fix?

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Code review check list

• Commit message template compliance.
• Commit message without typos.
• File names.
• Functions names.
• Functions docstrings.
• Unnecessary commited files?
• Extracted translations?