Add Japanese Translation for spdx-3-model repo.

[NorioKobota]

The Entries section of Vocabularies is next to the Metadata section(not translated), so could you check if it is okay to add the Japanese translation like this?
https://github.com/NorioKobota/spdx-3-model/blob/translation-ja-alpha/model/Core/Vocabularies/AnnotationType.md#entries-jp

And this PR is related to spdx/spdx-spec#1138 .

[bact]

Should the language code be ja instead of jp?

• Japanese Translation (partial) spdx-spec#1138 uses ja (matched ISO 639-1 language code for Japanese)
• jp is a country code (matched with "JP" for Japan in ISO 3166-1 alpha-2 two-letter country code)

[goneall]

Noticed one inconsistency on the language code

[zvr]

Converting this to draft, since it should be merged after 3.0.1 tagging and new branch has been created.