* wip generate directory for hash content
* cleanup, remove console logging
* add content caching module
* Return PDF stream ranges with compile response
* Return the PDF file size in the compile response
* PDF range endpoint
* [misc] WIP: pdf caching: preserve the m-time on static content files
* [misc] WIP: pdf caching: improve browser caching, emit caching headers
* [misc] WIP: pdf caching: do not emit very small chunks <1kB
* [misc] keep up with moving output files into a separate directory
* [OutputCacheManager] add global feature flag for enabling pdf caching
* [misc] add contentId into the URL for protecting PDF stream contents
* [misc] support PDF stream caching for anonymous users
* [misc] add per-request feature flag for enabling PDF stream caching
* [misc] enable pdf caching in CI and emit metrics at the end of run
* [misc] expose compile stats and timings to the frontend
* [misc] log an error in case saving output files fails
* [misc] add metrics for pdf bandwidth and pdf caching performance
* [misc] add a dark mode to the pdf caching for computing ranges only
* [misc] move pdf caching metrics into ContentCacheMetrics
* [misc] add a config option for the min chunk size of pdf ranges
Co-authored-by: Brian Gough <brian.gough@overleaf.com>
Co-authored-by: Eric Mc Sween <eric.mcsween@overleaf.com>
Set up generally useful stuff:
* chai.should()
* logger stubs
* globals in SandboxedModule, including Buffer and process, which are
now required in Node 12
