[blockly] Add persistence median methods

[mherwege]

Depends on openhab/openhab-js#376

[relativeci]

#2222 Bundle Size — 10.83MiB (~+0.01%).

f92d162(current) vs 5716165 main#2221(baseline)

Warning

Bundle contains 2 duplicate packages – View duplicate packages

Bundle metrics   1 change

	Current #2222	Baseline #2221
Initial JS	1.89MiB	1.89MiB
Initial CSS	576.5KiB	576.5KiB
Cache Invalidation	17.97%	17.67%
Chunks	226	226
Assets	249	249
Modules	2914	2914
Duplicate Modules	149	149
Duplicate Code	1.8%	1.8%
Packages	96	96
Duplicate Packages	2	2

Bundle size by type   1 change 1 regression

	Current #2222	Baseline #2221
JS	9.05MiB (~+0.01%)	9.05MiB
CSS	862.92KiB	862.92KiB
Fonts	526.1KiB	526.1KiB
Media	295.6KiB	295.6KiB
IMG	140.74KiB	140.74KiB
HTML	1.35KiB	1.35KiB
Other	871B	871B

Bundle analysis report Branch mherwege:blockly-median Project dashboard

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[florian-h05]

LGTM, thanks!

Just FYI this not only depends on the openhab-js PR, but also needs a new openhab-js release and a PR to the add-on to use the new version.