Items: Fix unit metadata not available for UoM groups

[florian-h05]

Fixes #1933.
Follow-up for #1901.

This enables the unit metadata for UoM groups (i.e. groups with a groupType of Number:).

[relativeci]

Job #1043: Bundle Size — 15.77MiB (-0.39%).

e6a1b8c(current) vs e0e328c main#1042(baseline)

⚠️ Bundle contains 16 duplicate packages

Metrics (5 changes)

	Current Job #1043	Baseline Job #1042
Initial JS	1.74MiB(-0.01%)	1.74MiB
Initial CSS	608.89KiB	608.89KiB
Cache Invalidation	93.96%	93.98%
Chunks	219	219
Assets	689	689
Modules	1720(-0.46%)	1728
Duplicate Modules	85(-3.41%)	88
Duplicate Code	1.72%(-10.42%)	1.92%
Packages	138	138
Duplicate Packages	15	15

Total size by type (3 changes)

	Current Job #1043	Baseline Job #1042
CSS	858.62KiB (-0.08%)	859.34KiB
Fonts	526.1KiB	526.1KiB
HTML	1.23KiB	1.23KiB
IMG	140.74KiB	140.74KiB
JS	9.26MiB (-0.46%)	9.3MiB
Media	295.6KiB	295.6KiB
Other	4.74MiB (-0.37%)	4.75MiB

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View job #1043 report View main branch activity

[ghys]

LGTM, thanks for keeping up on the UoM stuff

[florian-h05]

FYI, there is actually still something missing: On Item creation, there should be a unit field that is pre-filled with the system default unit for the chosen dimension. This way the unit metadata is set for new Items and it is ensured, that even when changing the measurement system, your persisted data won't get corrupted.

openhab/openhab-core#3611 added an REST endpoint for UoM information (all available dimensions with their system default unit), I plan to introduce a Vuex store for this data. I will also use this store for the Item type dialog, we then don't need to keep up with new dimensions as in #1926.