oh-repeater: Make caching configurable

[florian-h05]

Fixes #1956.

Adds a boolean property to the repeater (and relevant docs), cacheSource which allows the user to determine whether the repeater should refresh the source array with css and object changes or cache the source array for performance improvements.

Signed-off-by : Justin Georgi justin.georgi@gmail.com

[florian-h05]

Supersedes #1961, where lint was failing and the contributor was not available to fix it and I was not able to push to his branch.
As I just opened this PR and did not author it, I’ll self-merge.

[relativeci]

Job #1060: Bundle Size — 15.74MiB (~-0.01%).

2856af1(current) vs e232f69 main#1059(baseline)

⚠️ Bundle contains 16 duplicate packages

Metrics (1 change)

	Current Job #1060	Baseline Job #1059
Initial JS	1.67MiB(~+0.01%)	1.67MiB
Initial CSS	608.89KiB	608.89KiB
Cache Invalidation	93.94%	93.94%
Chunks	219	219
Assets	689	689
Modules	1700	1700
Duplicate Modules	90	90
Duplicate Code	1.95%	1.95%
Packages	138	138
Duplicate Packages	15	15

Total size by type (2 changes)

	Current Job #1060	Baseline Job #1059
CSS	859.34KiB	859.34KiB
Fonts	526.1KiB	526.1KiB
HTML	1.23KiB	1.23KiB
IMG	140.74KiB	140.74KiB
JS	9.24MiB (~-0.01%)	9.24MiB
Media	295.6KiB	295.6KiB
Other	4.72MiB (~-0.01%)	4.72MiB

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