[blockly] Add timer context

[stefan-hoehn]

Adds the possibility to provide any information to the timer's statement block that can be used when this block is eventually executed. This has become possible with the awesome addition in the jsscripting lib that @florian-h05 has provided to the createTimer-function.

Here are some examples how this can be used:

pinging @rkoshak as you might be interested to notice that.

[relativeci]

#1959 Bundle Size — 10.6MiB (~+0.01%).

735dbcb(current) vs 5282f44 main#1955(baseline)

Warning

Bundle contains 2 duplicate packages – View duplicate packages

Bundle metrics  no changes

	Current #1959	Baseline #1955
Initial JS	1.86MiB	1.86MiB
Initial CSS	607.87KiB	607.87KiB
Cache Invalidation	18.16%	18.16%
Chunks	223	223
Assets	246	246
Modules	2876	2876
Duplicate Modules	149	149
Duplicate Code	1.86%	1.86%
Packages	95	95
Duplicate Packages	2	2

Bundle size by type   1 change 1 regression

	Current #1959	Baseline #1955
JS	8.79MiB (+0.01%)	8.79MiB
CSS	890.75KiB	890.75KiB
Fonts	526.1KiB	526.1KiB
Media	295.6KiB	295.6KiB
IMG	140.74KiB	140.74KiB
HTML	1.24KiB	1.24KiB
Other	871B	871B

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Bundle analysis report Branch stefan-hoehn:blockly_timer_using Project dashboard

[florian-h05]

LGTM thanks!
I have to admit the code looks weird if there is no context, but it works and I couldn't find a quick solution.