Add a setting for prefix to count thumbnail timeouts

[dhruvkb]

Fixes

Related to #921 by @krysal

Description

This PR caches the number of times ReadTimeout occurs for a given domain, which can help us identify the providers that are the slowest for thumbnail generation. Then we can find ways to speed them up or work around their limitations.

Testing Instructions

Unit tests are included in the PR. They should be sufficient as there is no external change.

Checklist

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• [x] I added or updated tests for the changes I made (if applicable).
• [x] I added or updated documentation (if applicable).
• [x] I tried running the project locally and verified that there are no visible errors.

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[dhruvkb]

Merging this so that we can initiate a proper fix for WordPress/openverse#672.