Support configuration of beforeSend hook

[Legion2]

The sentry SDK for android and ios have both the beforeSend filter which allows to filter and manipulate events before they are send. Currently it is not possible to set the beforeSend filter in kotlin multiplatform.

[buenaflor]

Thanks for the suggestion, it's definitely on the list. Right now, we're focused on getting the first release out the door, so we may not be able to work on it immediately. But we'll definitely keep it in mind for future updates.

You are also free to open a PR if you'd like to implement it :)

[buenaflor]

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

[buenaflor]

Please beware that for 0.1.0 there is currently an issue where the SDK will drop events if beforeSend is not configured.
So to be on the safe side make sure to include beforeSend during Sentry.init if you are on 0.1.0. See #79

We will put out the fix asap

[buenaflor]

Now fixed on 0.1.1: https://github.com/getsentry/sentry-kotlin-multiplatform/releases/tag/0.1.1