Add a note to the entry (org-agenda-add-note)

[ktsujister]

Does this feature exist in Emacs orgmode core?

Yes

Orgmode link

• https://orgmode.org/manual/Agenda-Commands.html#index-z
• https://orgmode.org/org.html#index-org_002dagenda_002dadd_002dnote

Feature value

No response

Additional context

When I take notes using org-mode in emacs, I often use (org-agenda-add-note) C-c C-z to add notes to particular entry.
This is very helpful because it inserts timestamps when adding some notes in specified entry.

This was part of #455, but #455 was closed when #531 got merged, but left out org-agenda-add-note feature.