Introduce alternative methods for the methods that have redundancy/lengthy names.

[kazunarikudo]

Is your feature request related to a problem? Please describe.
Some method names are redundant or lengthy. For example:

• Harvester
  • cti_files
  • add_cti_file()
  • remove_cti_file()
  • remove_cti_files()
  • update_device_info_list()
• ImageAcquirer
  • is_acquiring_images()
  • start_image_acquisition()
  • stop_image_acquisition()

Describe the solution you'd like
Introduce alternative method names for those ones. For example:

• Harvester
  • cti_files ---> files
  • add_cti_file() ---> add_file()
  • remove_cti_file() ---> remove_file()
  • remove_cti_files() ---> remove_files()
  • update_device_info_list() ---> update()
• ImageAcquirer
  • is_acquiring_images() ---> is_acquiring()
  • start_image_acquisition() ---> start_acquisition()
  • stop_image_acquisition() ---> stop_acquisition()

The original methods are kept for the existing users but will be deleted at a future release. In the meantime, the original methods must explicitly tell users that they are using methods to be deprecated.

Describe alternatives you've considered
None.

Additional context
None.