Add error wrapper to conform any error type to IdentifiableError

[Jeehut]

This significantly improves the ease of use of the new error handling preset in the SwiftSDK. I wrote the helper added in this PR in my last app and it saved me a lot of repetitive code. I think it would make sense to ship as part of the SDK.

If merged, I can update the docs accordingly.

With this PR merged, rather than writing something like this every time I catch an error:

do {
  // ...
} catch {
  TelemetryDeck.errorOccurred(
    id: "SeriesRenamer.loadItemFailed", 
    category: .thrownException, 
    message: error.localizedDescription
  )
}

I can write this instead, saving unnecessary typing in many places:

do {
  // ...
} catch {
  TelemetryDeck.errorOccurred(
    identifiableError: error.with(id: "SeriesRenamer.loadItemFailed")
  )
}

[winsmith]

I like this! At some point we'll have to consolidate this with our plans on MetricKit and general error tracking, but this is a really good direction!

[Jeehut]

@winsmith We can talk about MetricKit in a call if you want to me to help realize it in the near future. I am available to work even more than currently agreed right now in case you need me to, as it sounds like a bigger task to me.

Having that said, I also need your decision for this PR: Do you think enough time has passed since the Swift 6 PR merged that we can make a new release? I have used the main branch in my apps without problems myself, but I don't know if you heard about any problems from other customers.

I created a new issue (TelemetryDeck/docs#101) for the docs update. But I'll wait until a new SDK release was made (otherwise customers could get confused).