Decouple the session loader into reader and writer over the cache #4445
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… them to improve performance fix haskell#4381
…p error loading and cradle files
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Renames getOptions to getOptionsWorker for clarity Removes redundant getOptionsLoop function Ensures session loading is called under the same `Action` context
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Follow up of #4439
Refactored session loader to use architecture that having multiple readers and writer over the cache .
In bigger project, HLS usually loading up slow. One of the main obstacle is that we are loading ghc options for files in strict sequential order.
I have made an attemp to improve the situation by refactoring this loading into reader and writer over cache. This way, the long laoding file won't be blocking already loaded files, making hls more responsive and smooth.