Develop ACE and BCE abstract base classes with co() API support

[01es]

Description

There is a need to introduce two abstract base classes for creating new ACE and BCE respectively, which would support the co(entityType) API similar to CommonEntityDao. These new classes should be used whenever an ACE or BCE handler needs to access any entity companion object operations.

Expected outcome

This enhancement is required to improve the instantiation time of ACE and BCE handlers that might have numerous dependencies on various companion objects, but a rich branching logic where the number of actually used companion objects during each execution is less than the total number of dependencies.