Feat create arbitrary name

[brandtkeller]

Description

Allow the ability to specify arbitrarily named definition files while retaining the current behaviors as default.

Related Issue

Fixes #4487

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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[codecov]

Codecov Report

❌ Patch coverage is 53.62319% with 32 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pkg/lint/schema.go	0.00%	11 Missing ⚠️
src/pkg/packager/create.go	33.33%	4 Missing and 2 partials ⚠️
src/pkg/packager/inspect.go	45.45%	4 Missing and 2 partials ⚠️
src/pkg/packager/load/load.go	73.91%	4 Missing and 2 partials ⚠️
src/pkg/packager/load/import.go	76.92%	2 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
src/cmd/package.go	39.47% <100.00%> (ø)
src/pkg/packager/load/import.go	51.37% <76.92%> (-0.27%)	⬇️
src/pkg/packager/create.go	54.16% <33.33%> (-2.66%)	⬇️
src/pkg/packager/inspect.go	36.58% <45.45%> (-0.34%)	⬇️
src/pkg/packager/load/load.go	46.92% <73.91%> (+1.86%)	⬆️
src/pkg/lint/schema.go	52.50% <0.00%> (-7.50%)	⬇️

... and 2 files with indirect coverage changes

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