Change saving method and format of optical pointing parameter

[TatsumiISHIKAWA]

Description

• In optical pointing, the driving data are saved other file (.dat).

  
      finally:
          save_filename = obsdatetime.strftime("%Y%m%d_%H%M%S") + ".dat"
          self.write_capture_list(
              directory=save_directory,
              filename=save_filename,
              az=cap_az,
              el=cap_el,
              pic_filename=cap_pic_filename,
              ra=cap_ra,
              dec=cap_dec,
              time=cap_time,
          )

- This saving method is not use recorder of necst.
- The recommended saving method is using `spectormeter/metadata`. Please discuss with @r-yamada1998 .