HDDS-14211. Extract base RDBBatchOperation, rename implementation to AtomicRDBBatchOperation

[swamirishi]

What changes were proposed in this pull request?

Rename RDBBatchOperation as AtomicRDBBatchOperation and introduce base abstract class RDBBatchOperation

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-14211

How was this patch tested?

Just refactoring no additional tests required

[swamirishi]

@adoroszlai I renamed the class here the diff ideally should only do rename RDBBatchOperation -> AtomicRDBBatchOperation and then create a new RDBBatchOperation class

[adoroszlai]

@swamirishi

This PR should not introduce the new base class, nor touch BatchOperation, both of which cause bigger diff due to the signature changes. Only:

create factory method RDBBatchOperation.newBatch() and replace existing calls to new RDBBatchOperation() with it. This is a trivial change that can be quickly merged.

(newAtomicOperation instead of newBatch is fine.)

[adoroszlai]

Created #9545 for the factory method. After that, this PR can focus on renaming RDBBatchOperation to AtomicRDBBatchOperation, adding the parent class as RDBBatchOperation, and moving the factory method to the new RDBBatchOperation.

[adoroszlai]

Can RDBBatchOperation be an interface instead of abstract class? (It was one in #9511.)

[swamirishi]

It can be only abstact classes since interfaces don't allow package private methods. The methods should not be exposed outside the db package