[ADD] Port account_jounral_period_close on 8.0

Migrate account_jounral_period_close to V8
@bwrsandman I do not agree, classes are in the same module in official addons and the file is not that long and the naming convention respect official addons name. There is no convention over coding in Odoo and no directive like that are descibes in OCA guidelines, even if I'm in favor of coherence in file and fields naming, I will not concider this at blocking