🔨 export subcommand of the CLI does not have a good documentation.

[ashwinvaidya17]

What is the motivation for this task?

When we pass incorrect parameters or request help when using anomalib export, it produces a verbose output. It is not readable and clear to the users.
Additionally, it also accepts capital values for enum types rather than allowing lowercase as well.

Describe the solution you'd like

Extend the verbosity options like anomalib train -h -v to the export method.

Additional context

Example of capitalization requirement

 Expected a member of <enum 'ExportType'>: {ONNX,OPENVINO,TORCH}. Got value: onnx