Improve module migration dependencies

[zakpatterson]

Migrating modules requires listing every necessary module by name, for example, if one wants the feature-requests module and the auth module, one must initialize via:

DatabaseConfig.initialize(config)("ct_auth", "ct_feature_requests")

ct_feature_requests requires the ct_auth module to exist first. So there should be a better way to encode this dependency, and remove the strings.

Those strings also have to be exactly those, as the initialize method is going to look in resources for s"db/$schemaName/migration" This is a string then that the module owns and should not need to be specified by the user.