Rename Versioned.getVersion() to getClassVersion()

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👾 Description of the issue

The interface com.swirlds.common.io.Versioned is used in the serialization api. It has a method int getVersion() that defines a version of a concrete class for serialization. Since the method name getVersion() often collide with downstream naming schemas (like if another interface or abstract class provides a getVersion() method) it should be renamed to getClassVersion().

Proposed Solution:

Refactor the int getVersion() method to int getClassVersion().

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hashgraph / hedera-services