Merge HoraeMeta code into HoreaDB repository

[ZuLiangWang]

Description
HoraeMeta is a sub-project of HoreaDB. We have been using an independent code repository to manage it before, but recently we have encountered some problems. For example, the data set for the integration test cannot be reused, and some CI also need to be written separately. This gives us The development caused some troubles. After discussion with PPMC group, we decided to merge all the code of the HoraeMeta repository into the HoreaDB repository.

Proposal
Merge HoraeMeta code into HoreaDB repository.

Additional context