Modify config importing

[TatsumiISHIKAWA]

Description

• https://github.com/necst-telescope/necst/blob/main/necst/rx/spectrometer.py
• https://github.com/necst-telescope/necst/blob/main/necst/procedures/observations/observation_base.py
• In this source code, importing config from /necst/__init__.py.
• But this description is not allowed.
• Please ensure this writing rule is correct.

To Reproduce

• spectrometer,

  ...
  from .. import config, namespace, topic
  ...
      self.record_condition = ConditionChecker(
          config.record_every_n_spectral_data or 1, True
      )

and observation_base,

...
from ... import config
...
            params = PointingError.from_file(config.antenna_pointing_parameter_path)
...

Expected behavior

...
from .. import namespace, topic
from neclib import config
...
        self.record_condition = ConditionChecker(
            config.record_every_n_spectral_data or 1, True
        )

...
from neclib import config
...
            params = PointingError.from_file(config.antenna_pointing_parameter_path)
...