Annotations tools various improvements

[YoannQDQ]

Description

This PR improve the behavior of annotation tools (Html, Text, Svg, Form and Move)

• Do not resize annotation when the cursor is not actually over the frame
  
• Add a context menu (When an annotation tool is activated) on the annotation items
  
• Drop the undocumented toggleTextItemVisibilities (when user presses Ctrl+T, toggle only the Text annotations visibility)
• Improve the selection and resizing behavior. Notably better handles overlapping annotations by not considering that an annotation is under the mouse if neither its frame nor anchor point are actually under the cursor. The behavior exhibited below was impossible before, as the large annotation would have prevented from selecting the small one.
  

[qgis-bot]

@YoannQDQ
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.
Also, any commit having [needs-doc] or [Needs Documentation] in will see its message pushed to the issue, so please be as verbose as you can.

Thank you!

[github-actions]

@YoannQDQ
A documentation ticket has been opened at qgis/QGIS-Documentation#8247
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]

@YoannQDQ

This pull request has been tagged for the changelog.

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