Fix broken `--output` command in @threlte/gltf

[MikeBellika]

Fixes #678.

Implemented a function parseFilePath to make everything a bit more readable. Generated by ChatGPT but LGTM.

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🦋 Changeset detected

Latest commit: 8d79682b0c3f5b44b878e47e7ae8bc4e025e67d8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@threlte/gltf	Minor

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