Add async save/load file ability.

[cyber-pc]

Purpose

The save/load file functionality does not work on the Application Processor (AP - non-main thread), even with resource locking. It can only operate on the Boot Strap Processor (BS - main thread).
This PR introduces the capability to save/load files on non-main threads by offloading the actual operations to the main thread.

Detail: https://github.com/orgs/qubic/projects/1?pane=issue&itemId=85821090

Design Features

• AsyncLoadFile (AsyncLoadLargeFile): Can be called from any thread to load a file. This is a blocking call until the load is complete.
• AsyncSaveFile (AsyncSaveLargeFile): Can be called from any thread to save a file. This can be either a blocking or non-blocking call.
• flushAsyncFileIOBuffer: this function performs the save/load operations and also releases the blocking calls of the above two functions.

How to use

• Initialize the file system with the additional EFI_MP_SERVICES_PROTOCOL* using initFilesystem(pServiceProtocol).
• Call AsyncLoadFile, AsyncLoadLargeFile, AsyncSaveFile, or AsyncSaveLargeFile with or without blocking flags, depending on the purpose.
• On main thread must frequently call flushAsyncFileIOBuffer.
• After done, need to call deInitFileSystem

Test. [UPDATED]

• Unit-test implementation
• An standalone UEFI testing for all functions is implemented in https://github.com/cyber-pc/qubic-core/tree/cyber-pc/uefi-file
• testnet run successfully with this PR
• testnet run successfully with this PR + enable async save file (keep the same logic with current master, and use async file io to repicate the behavior) and all files matched

Next Step

• For file IO on multiple-process, encourage to use the new asyncFileIO.
• For file IO on main process, can use the normal version.

[cyber-pc]

@philippwerner @Franziska-Mueller This PR is ready.