core(fr): add base gatherer class #11917
Merged
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Summary
Adds the base Fraggle Rock gatherer class that allows transition of gatherers to implement both APIs.
Why a new class instead of the augmenting the old class? Clarity. This approach allows anyone reading a gatherer file to immediately see whether it supports the new modes or not. We'll also be able to know from a type perspective that a gatherer doesn't support the new method, forcing a one-by-one examination of each gatherer as we upgrade them for FR.
Related Issues/PRs
ref #11313
Design Doc