New module to obtain data from Japanese observatories

@ejeschke , please ping interested parties here.

Is this the correct link to Japanese observatories archive? https://www.nao.ac.jp/en/research/project/adc.html

Thank you!

Start by reviewing the Japanese observatories archive link in the issue and the project's existing approach to accessing online data resources. Clarify the intended observatory, archive scope, interface, and acceptance criteria with maintainers before identifying implementation files or tests. Done should include an agreed module specification and tests for the supported archive queries.

Written by the indexing model from the issue text.