feat: iOS upload DebugMeta with exceptions

[vaind]

:scroll: Description

This enables support for loaded-libary-list (a.k.a DebugMeta) upload so that Sentry has all the info needed to symbolicate stacktraces.

:bulb: Motivation and Context

Necessary to get symbolication working for #444, but doesn't close the issue - that depends on changes in the flutter tool - PR - which means it will only work with a new flutter version after the PR is eventually merged.

:green_heart: How did you test it?

Manually on device (requires a local build of the patched flutter tool version):

• cd flutter/example; run.sh ios
• check the event on Sentry: https://sentry.io/organizations/sentry-sdks/issues/3170309318/events/154a2060d1234899aa217d9254cf0660/?project=5428562

:pencil: Checklist

• [ ] I reviewed submitted code
• [ ] I added tests to verify changes
• [ ] I updated the docs if needed
• [ ] All tests passing
• [ ] No breaking changes

:crystal_ball: Next steps