HDDS-15872. Ozone Bucket Support StoragePolicy and allowFallbackStoragePolicy.

[devmadhuu]

What changes were proposed in this pull request?

This PR is to add storagePolicy and allowFallbackStoragePolicy as first-class bucket properties. The two fields flow end-to-end from the client into the OM bucket record, through OmBucketInfo / OmBucketArgs serialization, and out again into recon and s3g stubs. The legacy hadoop.hdds.protocol.StorageType wrapper enum is removed from the client-side bucket API surface, but the storageType wire field is retained (as deprecated) for backward
compatibility with older peers — see below.

This is the client / OM-side data-model change only. There will be follow up PRs which will replace the current OzoneStoragePolicy.getDefaultPolicy() hard-coded default in OMKeyRequest.allocateBlock.

Protocol

hadoop-ozone/interface-client/src/main/proto/OmClientProtocol.proto:

• BucketInfo: added optional hadoop.hdds.StoragePolicyProto storagePolicy = 24; and optional bool allowFallbackStoragePolicy = 25;. The pre-existing storageType = 5 field is kept, marked [deprecated = true, default = DISK] and downgraded from required to optional for wire compatibility (see next section).
• BucketArgs: added optional hadoop.hdds.StoragePolicyProto storagePolicy = 14; and optional bool allowFallbackStoragePolicy = 15;. The pre-existing storageType = 6 is retained as optional [deprecated = true].

Both changes pass proto-backwards-compatibility (protolock).

Deleted

• hadoop-ozone/common/src/main/java/org/apache/hadoop/hdds/protocol/StorageType.java is removed. The Datanode-facing hadoop.hdds.protocol.proto.HddsProtos.StorageTypeProto enum is untouched and continues to describe DN volume types.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-15872

How was this patch tested?

~30 tests updated for the new bucket surface. Representative changes:

• OMRequestTestUtils.newBucketInfoBuilder no longer sets storageType on
  the proto (the field is reserved).
• TestOmBucketInfo, TestBucketManagerImpl, TestOMBucketCreateRequest,
  TestOMBucketCreateRequestWithFSO, TestOMClientRequestWithUserInfo,
  TestOzoneManagerHAWithAllRunning, OzoneRpcClientTests, TestEndpoints
  (recon) migrated from StorageType.X / getStorageType() to
  OzoneStoragePolicy.Y / getStoragePolicy().
• Recon AbstractTreeNSSummaryScenario and FlatNSSummaryScenario drop
  the storageType assertion (no storage-policy equivalent was set in
  those scenarios).

[devmadhuu]

@xichen01 This patch is adaptation of patch diff 13 from the tar. Thanks for your contribution. Kindly review adaptation patch.