feature: exported task resolver status types

[cb80]

Feature Description

In the registry we were missing logs when a task got cancelled. This happened because in the registry config a region was allowed in the validation rules, but was missing as target. It took us a while to figure this out. As a workaround we implemented openkcm/registry#189 but it would be better being able to log this in a more central place. But the TaskResolveFunc returns a private struct, which we cannot inspect in such a central place.

Proposed Solution

Proposal: Let the TaskResolveFunc return (or directly return) an exported struct, which represent the status of the task.
Goal: Enable consumers to inspect the exported struct to be able to log appropriately. E.e.:

switch taskStatus {
case TaskResolverCancelled:
    // log error
case TaskResolverContinue:
    // log warning
case TaskResolverComplete:
    // log success
}

Alternative Solutions

No response

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Additional Context

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