Implement `run` / `runAsync`, `runSave` / `runSaveAsync`

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run: Only runs consumer runAsync: Only runs consumer async

runSave: Runs and saves runSaveAsync: Runs and saves async

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Try to rename these methods (read/edit, read/write)

Idea:

• Read -> Reads and doesn't save
• Edit -> Reads, saves to memory
• Write -> Reads, saves to memory, writes to disk

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Rewritten logic so that it doesn't involve async code