Support dSYMs with IPA build uploads

[sentry-junior]

Port IPA + dSYM support for build upload from getsentry/sentry-cli#3393 into this CLI.

Current behavior

• build upload accepts IPA uploads, but does not take an explicit dSYM path to associate app debug symbols with the upload.
• IPA packages often omit dSYMs (especially after app thinning), so clients may need to construct a synthetic XCArchive themselves before upload.

Gap

• sentry-cli PR #3393 adds a --dsym option that finds the specified dSYM bundles, copies them into the synthetic XCArchive, and uploads with the IPA.
• That path is still missing here, so tooling that depends on this CLI (and migrations off sentry-cli) cannot offer the same IPA + dSYM upload flow.

Raised by Jamie Quadri.

Requested by bete.

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