[blockly] Allow setting persistence service for blocks

[stefan-hoehn]

fixes #1625

Allows to provide the persistence type to persistence blocks
default can be provided instead of selecting a particular one (is backward compatible to old blocks)
Either item name or item can be provided (note that variables must have the item not the item name as the type of variables cannot be detected)

[relativeci]

Job #1028: Bundle Size — 15.77MiB (+0.01%).

9d16372(current) vs c131139 main#1027(baseline)

⚠️ Bundle contains 16 duplicate packages

Metrics (1 change)

	Current Job #1028	Baseline Job #1027
Initial JS	1.73MiB(-0.03%)	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%	1.72%
Packages	138	138
Duplicate Packages	15	15

Total size by type (2 changes)

	Current Job #1028	Baseline Job #1027
CSS	858.62KiB	858.62KiB
Fonts	526.1KiB	526.1KiB
HTML	1.23KiB	1.23KiB
IMG	140.74KiB	140.74KiB
JS	9.26MiB (+0.01%)	9.26MiB
Media	295.6KiB	295.6KiB
Other	4.73MiB (~+0.01%)	4.73MiB

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View job #1028 report View main branch activity

[florian-h05]

Overall LGTM, just a few questions.

[florian-h05]

LGTM, thanks!