refactor(fs): Refactor Resource internals

* Improve handling for concurrent resource access and modifications,
  especially when buffering streams.
* Deprecate getStatInfo in favor of dedicated getSize, isDirectory,
getLastModified methods.
* Deprecate synchronous getStream in favor of getStreamAsync and
  modifyStream, allowing for atomic modification of resource content
* Generate Resource hash using ssri

Author: RandomByte