Entity ID types do not match types in database definition

As Liquibase is used, JPA does not manage database definition.
Within Liquibase changelog, only Anchor and Fragment have BIGINT (Long)
IDs. Other entities have INTEGER IDs.

- Change AnchorEntity/AnchorRepository ID type to Long
- Change YangResourceEntity/YangResourceRepository and
  ModuleReferenceRepository ID to Integer
- Modify datatypes of foreign key references in liquibase changelog to
  use correct types for dataspace_id, schema_set_id, yang_resource_id
- Update test liquibase changelog

Issue-ID: CPS-1676
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I26de6712b2e74d166fc5a48b1f8149de6a1e5199
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>