[6.x] Cache image extension support lookups - #15449
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ImageValidator::isValidExtension()calls the image driver on every url, which adds up on image-heavy sites.The proposed fix in this PR is to cache results by driver class and lowercased extension. This wasn't an issue in 5.x because the lookup there was over a simple array, not via the driver itself. We managed to shave off 700ms from an image-heavy page with this change.