Introduce granulated Media Gallery ACL resources and enforce for new media gallery

[sivaschenko]

Story #1485

Description

Use Magento_MediaGallery::media_gallery ACL resource instead of Magento_Cms::media_gallery
The Magento_MediaGallery::media_gallery ACL resource should have the following subresources:
** Upload assets
** Delete assets
** Insert assets into the content
** Create folder
** Delete folder

The resources should be added to app/code/Magento/MediaGallery/etc/acl.xml file in magneto2 repo
The introduced ACL resources should be enforced for the new media gallery (Enhanced Media Gallery is enabled)
The ACL resources should affect if corresponding buttons/components are displayed to the user and if the controllers/services accept the actions

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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