Support configuration of fingerprint for Events

[Legion2]

To group issues and messages in the sentry ui, normally the stack trace is used, but we want to customize the grouping for specific issues. The Android and IOS sdk allow to set a fingerprint for issues and messages, which used to group the issues in sentry.

It should be possible to set the fingerprint via the multiplatform sdk.

[buenaflor]

We've shipped this in 0.1.0: https://github.com/getsentry/sentry-kotlin-multiplatform/releases/tag/0.1.0