DIY-OOD uninstall performance issue with deleting NameObject files.

[lizhihongTest]

Describe the bug
I run uninst.exe to uninstall my DIY-OOD.It took 30 minutes and the uninstallation is still not complete

To Reproduce

• I stored 500,000 objects via put_object.
• Excute C:\cyfs\uninst.exe

System information
System ：windows10
DIY-OOD : CYFSOOD-x86-64-1.1.1.30-beta.exe

Additional context

[lurenpluto]

During the uninstall process of DIY OOD, in most cases, the local data (objects and chunks) will be retained, as many of these are critical user data. Only some binary files and cache files will be unloaded. Is your issue related to the data being cleared during the unloading process as well?

Currently, the noc's object storage uses blob mode. In the case of having a large number of objects, I'm not sure if this step is causing the slow uninstall process. However, even so, it shouldn't take half an hour to finish.

[lizhihongTest]

I confirm that the current uninstallation program does delete local data (objects and chunks), and it traverses all subdirectories under the C:\cyfs\data\named-object-cache\objects directory to delete files. However, it only deletes one file at a time, so the uninstallation speed is very slow.This could be due to the uninstallation program not deleting the folders and instead using a recursive algorithm to delete one file at a time.

[lurenpluto]

Currently, object blobs are stored in a two-level directory structure with single files, under the named-object-cache\objects directory. When the total number of objects is large, this directory will have a large number of first and second-level sub directories, so some traversal operations on this directory can be slow.

A few suggestions when uninstalling:

• If the uninstall operation does not need to delete data (including objects and chunks), there is no need for additional processing of the objects directory during deletion, and it can be omitted.
• If the uninstall operation does indeed need to delete data, it is better to handle the objects directory by deleting the top-level directory directly, rather than attempting to traverse these operations.

[weiqiushi]

We used NSIS's built-in RMDir function to delete the CYFS directory, and I'm afraid there's very little we can do if it's the implementation of this function that's faulty