fix: add DataAssemblyCollection alias and fix Fragment metadata type [DX-1004]

[Michael Pham (michaelphamcf)]

DX-1004

Summary

• Add missing DataAssemblyCollection type alias (consistent with ExperienceCollection, TemplateCollection, etc.)
• Fix FragmentProps.metadata type from ExoMetadataProps → ExperienceMetadataProps to match upstream schema (Fragment inherits from Experience, which uses the extended metadata type with name?)
• Export DataAssemblyCollection from the SDK's public type surface

Test plan

• tsc --noEmit passes
• Verify DataAssemblyCollection is importable from contentful-management
• Verify FragmentProps.metadata now accepts name field

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