Attach a custom stacktrace when capturing an exception

*Platform:*

- [X] iOS
- [ ] tvOS
- [ ] MacOS
- [ ] watchOS

*Swift:*

- [X] Yes -> any
- [ ] No

*sentry-cocoa installed with:*

- [X] CocoaPods
- [ ] Carthage
- [ ] Manually

Version of sentry-cocoa:
**5.2.2**

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**I have the following issue:**

I'm writing a sample that uses Sentry for [the CrashKiOs library](). The library basically lets you create a custom NSException with a custom stacktrace [(here]() for reference) and I want to log this exception with Sentry. But I noticed that this custom stacktrace is never uploaded.

After digging in the source code, I've noticed that the capture method does not use the `callStackReturnAddresses` of the exception passed in the capture method but it adds it builds it for the current thread.

There is already the possibility to append a custom stacktrace and I haven't found it? If not, there is any possibility to add it in the future? With Firebase Crashalytics or Bugsnag you can but I prefer using Sentry

**Steps to reproduce:**

To reproduce the issue, [I've uploaded the WIP sample](). In the same repo you can find also the working sample for Crashalytics and Bugsnag