Add AttachmentStreamResource with properly handled filename encoding. Use in UploadField. (MGNLUI-8189)

[MGNLUI-8191] Review Created: 14/Jul/23  Updated: 14/Jul/23

Status: To Do
Project: Magnolia UI
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Sub-task Priority: Neutral
Reporter: Šimon Demočko Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

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Team: AuthorX
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