IGVF-DACC / igvf-ui / #4695

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IGVF-2056 Cache common objects (#646)

* Add a class to use the Redis cache easily for any generic data. Use this new API for the home page. Don’t cache the files and samples — just the file sets.
* Make a new `/api/profiles` endpoint to handle requests for `/profiles` while caching the results. Make a new module specifically to fetch and cache profiles. I might make it more generic in the next commit
* Some small cleaning up.
* Update the ServerCache class to specify the fetch configuration _after_ instantiating the class to work better when caching data with data *not* from the data provider. Add a convenience function to retrieve and cache entire objects from the data provider. All places that load the `/profiles` object now cache the profiles.
* Cache the collection-titles endpoint.
* Split getCacheClient() into its own file so we can skip Jest testing it. Add Jest tests for the cache.ts module.
* Remove a couple unused variables.
* Add documentation for the cache.ts module.
* Add a `ttl` parameter to `retrieveCacheBackedData` and set it to 20 minutes for /profiles and /collection-titles.
* Return the /profiles and /collection-titles `ttl` values back to one hours. I changed my mind.
* Have the audit documentation page use the /profiles cache.
* Add debugging code.
* This reverts commit 327ca67a1.

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