feat(vue): Export Vue exception capture helper

[vansh-nagar]

Exports captureVueException from @sentry/vue together with its ViewModel type. The helper applies the same component metadata and mechanism data as the automatic Vue handler, but captures synchronously so an onErrorCaptured boundary can call it inside withScope without losing per-error scope data across a timer.

The automatic application handler still defers capture to the next event loop and now shares the metadata-building path with the public helper.

Validated with the focused 14-test Vue error-handler suite, the Vue dependency-aware type build, and type-aware package lint.

Fixes #11471

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