fix: graceful error handling for failed /vsicurl/ requests #17
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In some instances (I personally have not encountered it) the server can produce an invalid response when accessing COG with /vsicurl/, which causes
terra::rast()to error internally with otherwise valid URLs.This PR allows for 3 retries: the first after 3 seconds, second after 7 seconds, third after 20 seconds. There will be a warning produced if still failing after 3 retries, and then the offending raster will be skipped in the result.
Closes #14