Request: Adding a GET API of attachment files (for downloading images in posts)

[emadurandal]

Informations

Is your feature request related to a problem? Please describe.
This is a feature request for Growi v3 API.
I hope a GET API of attachment files, e.g. images in a post.
Current Growi doesn't have the API.
(reference conversation: https://wsgrowi.slack.com/archives/C4V5ZG4UC/p1638513138079700 )

Describe the solution you'd like
I'm glad if the API will be implemented.

Describe alternatives you've considered
Nothing special