2024.9.x feature group blocks

[Toocky]

The following changes are implemented

Finished building group block
#2278

Changes in the user interface:

Select the blocks you want within the group,
You can also select the level of padding between blocks within the group

here is an example of a group block within a tab block with a record list a calendar and a map

Checklist when submitting a final (!draft) PR

• Commits are tidied up, squashed if needed and follow guidelines in CONTRIBUTING.md
• Code builds
• All existing tests pass
• All new critical code is covered by tests
• PR is linked to the relevant issue(s)
• Rebased with the target branch

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