Allow to create an empty GeoPackage from the context menu of the top-level GeoPackage node (fix #25116)

[alexbruy]

Description

There an inconsistency in behavior of the "Create Database" context menu item for SpatiaLite and GeoPackage nodes in the Browser. In case of SpatiaLite this action creates an empty database and adds a new connection while the same action for GeoPackage creates a new GeoPackage file with a layer and adds a new connection.

This is not only confusing but also not very convinient in some use cases when user needs an empty GeoPackage. Of course, it is possible to create an empty GeoPackage from the context menu of the directory nodes, but this again is not very intuitive and many users are not aware about this option.

This PR renames existing "Create Database" action to "Create Database and Layer" action and adds a new context menu action "Create Database" which creates an empty GeoPackage.

Fixes #25116.

Funded by NaturalGIS.

[qgis-bot]

@alexbruy
This pull request has been tagged as requiring documentation.

A documentation ticket will be opened at https://github.com/qgis/QGIS-Documentation when this PR is merged.

Please update the description (not the comments) with helpful description and screenshot to help the work from documentors.
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[github-actions]

🪟 Windows builds ready!

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(Built from commit 8deddbd)

[qgis-bot]

@alexbruy
A documentation ticket has been opened at qgis/QGIS-Documentation#9150
It is your responsibility to visit this ticket and add as much detail as possible for the documentation team to correctly document this change.
Thank you!

[qgis-bot]

@alexbruy

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