Refactor *ServiceMigrator and *SchemaRegistry classes by extracting common logic

[imalygin]

@tinker-michaelj suggested the following idea as a follow-up for #16379 :

it would be nice at some point if we could extract the common logic between the OrderedServiceMigrator/MerkleSchemaRegistry and FakeServiceMigrator/FakeSchemaRegistry types and reduce duplication between the subprocess and embedded Hedera state lifecycles.

That is, the idea is to consider OrderedServiceMigrator / FakeServiceMigrator and MerkleSchemaRegistry / FakeSchemaRegistry pairs, extract common logic to a class that resides in swirlds-state-impl. This will help to reduce the logic duplication