Refactor configuration parsing option and add configuration structure using dataclass.

[YooSunYoung]

Fixes #8

Main Updates

It is mostly copied-pasted from the original code.
I adjusted some names and made the option-names consistent between configuration file and argument parser.
The result of the argument/configuration parsing is now a dataclass so that
it's easier to access to each options in other functions.

Tests

• options in the configuration file and argument parsed options have consistent names
• The configuration template have all possible options.
• Run-time arguments overwrite the configuration file options correctly.
• The original option dictionary is read-only.