[blockly] Add dictionary loop

[stefan-hoehn]

fixes #1711
This adds a new loop type which allows to iterate over a dictionary as follows

It allows to either pass a variable (trusted to be of type Dictionary) or a Dictionary-Block itself.

[relativeci]

Job #1004: Bundle Size — 15.77MiB (~+0.01%).

8644ccf(current) vs 9685f0f main#1003(baseline)

⚠️ Bundle contains 16 duplicate packages

Metrics (2 changes)

	Current Job #1004	Baseline Job #1003
Initial JS	1.73MiB(-0.02%)	1.73MiB
Initial CSS	608.89KiB	608.89KiB
Cache Invalidation	93.95%	93.95%
Chunks	219	219
Assets	689	689
Modules	1720	1720
Duplicate Modules	85	85
Duplicate Code	1.72%(-0.58%)	1.73%
Packages	138	138
Duplicate Packages	15	15

Total size by type (2 changes)

	Current Job #1004	Baseline Job #1003
CSS	858.62KiB	858.62KiB
Fonts	526.1KiB	526.1KiB
HTML	1.23KiB	1.23KiB
IMG	140.74KiB	140.74KiB
JS	9.25MiB (+0.01%)	9.25MiB
Media	295.6KiB	295.6KiB
Other	4.73MiB (~+0.01%)	4.73MiB

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[florian-h05]

LGTM, thanks!