feat(values): support values imports with namespacing

[brandtkeller]

Description

This adds support for namespacing an imported component artifacts templates and values/schema files on import to prevent silent collisions.

Related Issue

Fixes #4584

Checklist before merging

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

[netlify]

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[codecov]

Codecov Report

❌ Patch coverage is 30.43478% with 224 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pkg/packager/load/import.go	24.38%	171 Missing and 12 partials ⚠️
src/pkg/packager/load/load.go	35.89%	22 Missing and 3 partials ⚠️
src/internal/template/template.go	0.00%	6 Missing ⚠️
src/cmd/dev.go	0.00%	5 Missing ⚠️
src/pkg/packager/dev.go	0.00%	5 Missing ⚠️

Files with missing lines	Coverage Δ
src/pkg/packager/create.go	58.16% <100.00%> (+2.24%)	⬆️
src/pkg/packager/find_images.go	57.27% <100.00%> (+0.65%)	⬆️
src/pkg/packager/inspect.go	37.84% <100.00%> (+0.87%)	⬆️
src/pkg/packager/lint.go	70.96% <100.00%> (+4.30%)	⬆️
src/pkg/packager/publish.go	65.51% <100.00%> (+0.81%)	⬆️
src/cmd/dev.go	45.94% <0.00%> (-0.27%)	⬇️
src/pkg/packager/dev.go	0.00% <0.00%> (ø)
src/internal/template/template.go	77.90% <0.00%> (-2.68%)	⬇️
src/pkg/packager/load/load.go	41.45% <35.89%> (-2.01%)	⬇️
src/pkg/packager/load/import.go	40.03% <24.38%> (-9.73%)	⬇️

... and 1 file with indirect coverage changes

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[brandtkeller]

Closing as an option we're not pursuing for values merge.