Data Source Manager STAC extras

[uclaros]

Description

This is a followup of #59534

It adds the following functionality to the STAC page in data source manager:

• Display footprints of the search results items in the map canvas
• Highlight selected item's footprint
• Allow hiding the footprints

Also adds in the Items' context menu:

• Zoom to Item option
• Pan to Item option
• Option to add a single Asset as a Layer
• Option to download the item's Assets
  

For downloading assets, the same dialog is used as the one in the browser implementation

[github-actions]

🪟 Windows builds

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Debug symbols for this build are available here.
(Built from commit 97784cb)

🪟 Windows Qt6 builds

Download Windows Qt6 builds of this PR for testing.
(Built from commit 97784cb)