In the migrations directory of data repos, have YAML files with lists of the files that are under the control of the schema

[jonrkarr]

Currently, I have lists of files that need to be migrated within wc_lang/migrations and wc_kb/migrations.

It would be better to maintain these lists within the data repos. This would make it easier to identify which files need to be migrated forward when making changes to obj_tables, wc_kb, or wc_lang.

We would need one YAML file per schema, or we need track the schema for each data file.