Add readonly mode for file-based pages and widgets

[jimtng]

UI implementation of openhab/openhab-core#5493

Note: this PR changes the YAML syntax in the Code tab:

• remove special keys for the slots. Instead, the slots are displayed in the YAML as is.
• always show the component: key.

This is so that the yaml code is compatible with the file-based syntax, making it copy-pasteable to/from file.

[relativeci]

#5314 Bundle Size — 13.85MiB (+0.05%).

d653e32(current) vs 6a86839 main#5313(baseline)

Warning

Bundle contains 2 duplicate packages – View duplicate packages

Bundle metrics   5 changes 1 regression

	Current #5314	Baseline #5313
Initial JS	1.41MiB(+0.06%)	1.41MiB
Initial CSS	0B	0B
Cache Invalidation	16.19%	16.18%
Chunks	699(+0.29%)	697
Assets	818(+0.25%)	816
Modules	2820(+0.07%)	2818
Duplicate Modules	0	0
Duplicate Code	0%	0%
Packages	126	126
Duplicate Packages	1	1

Bundle size by type   2 changes 2 regressions

	Current #5314	Baseline #5313
JS	11.54MiB (+0.05%)	11.53MiB
CSS	902.29KiB (+0.03%)	901.98KiB
IMG	638.41KiB	638.41KiB
Fonts	526.1KiB	526.1KiB
Media	295.6KiB	295.6KiB
Other	847B	847B

Bundle analysis report Branch jimtng:editable-uicomponents Project dashboard

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