feat(loader/cache): add data dir fallback if wasm layer not found #1941
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Pre-emptive 'futureproofing' in anticipation of the wasm layer media type changing in the future (see #1882 (comment)).
This change is intended for the forthcoming 2.0 release. With this logic in place, 2.0 clients should continue to be able to pull Spin apps published by a future version of Spin with the wasm layer media type changed.