finalize plugin.importFiles api

[samuelstroschein]

Quite a banger PR:

• increases ease of use by removing nesting of bundles
• enables partial imports and never fails (automatically creates bundles, messages if not exist. users can easily remove undesired imports with lix change control)
• future proofs api by have dedicated import export types
• improves plugin experience by eliminating need for pseudo ids
• enables optional importing entities by their id (instead of always matching against heuristics)

Closes:

• NewBundleNested in importer type is odd inlang-sdk#215
• importFiles & exportFiles interface update to remove the need for ids inlang-sdk#208

[changeset-bot]

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Latest commit: 99bbeaf

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