fix: enhance file deletion handling and add option to hide uploading files and fix cloudreve refresh_token get error

[alist666]

cloudreve 文件删除方法和修改refresh_token获取错误

[petercat-assistant]

Walkthrough: This PR enhances the file deletion handling in the Cloudreve driver by implementing a retry mechanism for lock conflicts, adds an option to hide files currently being uploaded, and fixes the refresh token retrieval error. Additionally, it changes the HTTP method for a callback request.

Changes:

File	Summary
drivers/cloudreve_v4/driver.go	Enhanced file deletion with retry on lock conflict, added filter to hide uploading files, fixed thumbnail condition, and corrected rename endpoint.
drivers/cloudreve_v4/meta.go	Added HideUploading option to configuration.
drivers/cloudreve_v4/types.go	Introduced constants for metadata keys, changed Metadata type, and added FileDeleteResp struct.
drivers/cloudreve_v4/util.go	Fixed refresh token logic and changed callback request method from POST to GET.

[petercat-assistant]

The retry mechanism for lock conflicts in file deletion is a good addition. However, ensure that the error handling for the del() function is robust enough to handle unexpected errors beyond lock conflicts.

[petercat-assistant]

Changing the HTTP method from POST to GET for the callback request might have implications on the server-side logic. Ensure that the server is configured to handle GET requests for this endpoint.