Add ResolveObserver to jsg/observer.h #1977
Merged
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This separates out the new ResolveObserver interface from the new module registry PR in order to make it easier to review and further reduce the size of that other PR. This only adds the definition and does not introduce any code that uses it. That'll come with the module registry PR.
The idea is to improve observability of the module resolution process, including tracking the failure cases. For workerd, these observers are non-ops by default but can be set up by embedders to have actual backing implementations.
Refs: #1553