Move classes to dataclass

[pgiraud]

The idea is to improve the code base by defining classes using dataclass.

• conf.Configuration, Define Configuration as a dataclass #141
• conf.Entry, define conf.Entry as a dataclass #135
• ctl.PgCtl,
• ctl.AsyncPGCtl,
• Define errors.ParseError as a dataclass #152
• Define hba.HBARecord as a dataclass #148
• Define hba.HBA as dataclass #151
• pgpass.PassComment, WIP: Define pgpass as a dataclass #147
• pgpass.PassEntry, WIP: Define pgpass as a dataclass #147
• pgpass.PassFile, WIP: Define pgpass as a dataclass #147
• service.Service,
• sercice.ServiceFile,
• log.parser.*