Allows to add a custom stacktrace through the log API

[ArielDemarco]

Overview

This PR adds a new stack trace case to the StackTraceBehavior enum: custom(_ value: EmbraceStackTrace).

This allows SDK clients to add their own stack traces to logs, which can be useful, for example, when dealing with past events.

EmbraceStackTrace includes all necessary validations to ensure the stack trace (and its frames) adhere to the required format. By design, it throws an error (EmbraceStackTraceError) when attempting to create an invalid stack trace that cannot be used later by Embrace.

Limits & Format:

• Each frame should follow the format: <index> <image> <memory address> <symbol> [ + <offset> ]. The "+ <offset>" part is optional.
• Each frame cannot be longer than 10.000 characters.
• We'll trim stacktraces with more than 200 frames.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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