feat(values)!: support values merge on import

[brandtkeller]

Description

WIP

Related Issue

Fixes #4584

Relates to #

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

[netlify]

✅ Deploy Preview for zarf-docs canceled.

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🔨 Latest commit	ab0482b
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[codecov]

Codecov Report

❌ Patch coverage is 34.54545% with 72 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pkg/packager/load/import.go	27.50%	25 Missing and 4 partials ⚠️
src/pkg/packager/layout/assemble.go	11.53%	22 Missing and 1 partial ⚠️
src/pkg/packager/load/load.go	57.89%	7 Missing and 1 partial ⚠️
src/pkg/value/value.go	0.00%	7 Missing ⚠️
src/pkg/packager/dev.go	0.00%	3 Missing ⚠️
src/cmd/dev.go	0.00%	2 Missing ⚠️

Files with missing lines	Coverage Δ
src/api/v1alpha1/component.go	15.25% <ø> (ø)
src/pkg/packager/create.go	57.29% <100.00%> (+1.37%)	⬆️
src/pkg/packager/find_images.go	56.88% <100.00%> (+0.26%)	⬆️
src/pkg/packager/inspect.go	37.19% <100.00%> (+0.22%)	⬆️
src/pkg/packager/lint.go	67.85% <100.00%> (+1.19%)	⬆️
src/pkg/packager/publish.go	66.85% <100.00%> (+0.18%)	⬆️
src/cmd/dev.go	46.14% <0.00%> (-0.07%)	⬇️
src/pkg/packager/dev.go	0.00% <0.00%> (ø)
src/pkg/value/value.go	75.53% <0.00%> (-2.34%)	⬇️
src/pkg/packager/load/load.go	45.08% <57.89%> (+1.63%)	⬆️
... and 2 more

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