background loading for avatars

[fschade]

Description

if you had many file shares the avatar loading took a long period of time and blocked the ui, thats the nature os async await. This introduces a async / await background loading using iife.

The avatars now getting displayed initially with the initials and then get updated once loaded.

Related Issue

• Fixes Send avatar requests in the background #4973

Motivation and Context

get the fileslist view rendered non blocking

How Has This Been Tested?

• test environment:
• locally

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• Changelog
• Tests

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[pascalwengerter]

Looks awesome! Needs some tests and then we're ready to go 🎯

[ownclouders]

💥 Acceptance tests Move failed. Please find the screenshots inside ...

https://drone.owncloud.com/owncloud/web/15394/

webUIMoveFilesFolders-moveFiles-feature-105.png

[kulmann]

Neat improvement 😍