open source staros java source code

Why I'm doing:

What I'm doing:

#63826

What type of PR is this:

[ ] BugFix
[ ] Feature
[x] Enhancement
[ ] Refactor
[ ] UT
[ ] Doc
[ ] Tool

Does this PR entail a change in behavior?

[ ] Yes, this PR will result in a change in behavior.
[x] No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

[ ] Interface/UI changes: syntax, type conversion, expression evaluation, display information
[ ] Parameter changes: default values, similar parameters but with different default values
[ ] Policy changes: use new policy to replace old one, functionality automatically enabled
[ ] Feature removed
[ ] Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

[ ] I have added test cases for my bug fix or my new feature
[ ] This pr needs user documentation (for new or modified features or behaviors)
- [ ] I have added documentation for my new feature or new function
[ ] This is a backport pr

Bugfix cherry-pick branch check:

[x] I have checked the version labels which the pr will be auto-backported to the target branch
- [ ] 4.0
- [ ] 3.5
- [ ] 3.4
- [ ] 3.3

[!NOTE] Introduce the StarOS Java implementation with shard/worker management, gRPC agent, placement/scheduling, file stores, utilities, and comprehensive tests.

Starlet (gRPC) Agent:

StarletAgent with heartbeat, add/remove shard RPCs, retries, and channel/stub lifecycle.

Mock agents for unit tests.

Worker Management:

Worker, WorkerGroup, WorkerManager with create/update/delete, heartbeats, dump/load image, and dynamic thread-pool sizing.

Resource provisioning via DefaultResourceManager (external or builtin test server) and factory.

Shard Management:

Shard, ShardGroup, MetaGroup (PACK/SPREAD/EXCLUDE), anonymous group handling, and meta-group operations.

Health/balance checker and ShardSchedulerV2 (add/remove to worker/group, batch, balancing, temp replicas).

ShardPolicyFilter with EXCLUDE policy.

File Store/Path:

S3/HDFS/Azure Blob/ADLS2/GS stores, replace/update flows, path and checksum utilities.

Utilities/Infra:

Config, logging, ID generator, abstract server, metrics, log dumping tool (ReadImage).

HTTP/Service:

HTTP dispatcher/service endpoints; StarManager orchestration.

Tests:

Extensive unit tests covering managers, scheduler, shard/replica states, file stores, HTTP, journal replayer, and provisioner.

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