HDDS-15946. [Ozone versioning] VersionId generation strategy framework

[symious]

What changes were proposed in this pull request?

First 6 commits belong to HDDS-15879, can ignore them.

This ticket includes the follows tasks:

Sub-task	Scope	Acceptance
T2.1 interface + default generator	VersionIdGenerator interface; TransactionIndexVersionIdGenerator; the ozone.om.versioning.version-id-generator class-name config, loaded reflectively	shared contract test (strictly increasing / frozen / reserved ids) run against every generator; unknown class and class not implementing the interface both rejected; default generator carries no allocator state
T2.2 commit-time ordering check	VersionIdAllocator: refuse a commit whose id does not come after the key's current version; fall back to a versionedKeyTable lookup for records predating versioning	increasing id accepted; id at or below the current one rejected with INVALID_REQUEST; taken id on a pre-versioning record rejected with KEY_ALREADY_EXISTS; steady state performs no lookup (unit test asserts versionedKeyTable is never touched)
T2.3 pinned-first generator	PinnedFirstVersionIdGenerator: first-version detection (no current in keyTable) + FIRST_VERSION_ID = 1 sentinel	first PUT gets the sentinel, later PUTs get transaction indexes; sentinel sorts before every transaction index; sentinel does not collide with the null slot; selectable by configuration

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-15946

How was this patch tested?

Unit test