Adding large payload support for the standalone SDK

[bachuv]

Issue describing the changes in this PR

Adding large payload support for the standalone SDK

resolves #issue_for_this_pr

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes are added to the CHANGELOG.md
• I have added all required tests (Unit tests, E2E tests)

[Copilot]

Pull request overview

This PR adds “large payload” support to the standalone Durable Task Java SDK by introducing an Azure Blob Storage–backed payload externalization module and wiring gRPC interceptors + orchestrator-response chunking into the core client/worker to avoid gRPC message size limits.

Changes:

• Introduces new :azure-blob-payloads module implementing payload externalization/resolution via a gRPC ClientInterceptor and an Azure Blob–backed PayloadStore.
• Adds gRPC interceptor support to DurableTaskGrpcClientBuilder/DurableTaskGrpcWorkerBuilder, plus worker capability announcement and orchestrator completion chunking.
• Adds a runnable sample and unit/integration tests covering token handling, interceptor behavior, and chunking behavior.

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
settings.gradle	Adds the new :azure-blob-payloads Gradle module to the build.
samples/src/main/java/io/durabletask/samples/LargePayloadSample.java	New sample demonstrating end-to-end large payload externalization with DTS + Azurite.
samples/build.gradle	Adds a runLargePayloadSample task and depends on :azure-blob-payloads.
internal/durabletask-protobuf/protos/orchestrator_service.proto	Updates protobuf contract (tags, rewind action, purge timeout).
internal/durabletask-protobuf/PROTO_SOURCE_COMMIT_HASH	Updates upstream proto source commit hash.
client/src/test/java/com/microsoft/durabletask/OrchestratorChunkingTest.java	Adds unit tests for worker chunking + action-size validation + capability announcement.
client/src/main/java/com/microsoft/durabletask/DurableTaskGrpcWorkerBuilder.java	Adds interceptor registration, LP capability flag, and configurable chunk size.
client/src/main/java/com/microsoft/durabletask/DurableTaskGrpcWorker.java	Applies interceptors, announces LP capability, and implements orchestrator-response chunking/validation.
client/src/main/java/com/microsoft/durabletask/DurableTaskGrpcClientBuilder.java	Adds interceptor registration support to the client builder.
client/src/main/java/com/microsoft/durabletask/DurableTaskGrpcClient.java	Applies registered interceptors to the client channel.
client/build.gradle	Adds grpc-inprocess for new in-process gRPC unit tests.
azure-blob-payloads/src/main/java/com/microsoft/durabletask/azureblobpayloads/PayloadStore.java	Introduces PayloadStore abstraction for out-of-band payload storage.
azure-blob-payloads/src/main/java/com/microsoft/durabletask/azureblobpayloads/PayloadStorageException.java	Defines exception type for permanent storage failures.
azure-blob-payloads/src/main/java/com/microsoft/durabletask/azureblobpayloads/LargePayloadWorkerExtensions.java	Adds worker-side helper methods to enable externalized payloads + capability flag.
azure-blob-payloads/src/main/java/com/microsoft/durabletask/azureblobpayloads/LargePayloadStorageOptions.java	Adds configuration options (threshold/max/container/auth/compression).
azure-blob-payloads/src/main/java/com/microsoft/durabletask/azureblobpayloads/LargePayloadInterceptor.java	Implements interceptor that externalizes outbound payloads and resolves inbound tokens.
azure-blob-payloads/src/main/java/com/microsoft/durabletask/azureblobpayloads/LargePayloadClientExtensions.java	Adds client-side helper methods to enable externalized payloads.
azure-blob-payloads/src/main/java/com/microsoft/durabletask/azureblobpayloads/BlobPayloadStore.java	Implements Azure Blob Storage payload store with optional gzip compression.
azure-blob-payloads/src/test/java/com/microsoft/durabletask/azureblobpayloads/PayloadTokenTest.java	Unit tests for token encode/decode and token detection.
azure-blob-payloads/src/test/java/com/microsoft/durabletask/azureblobpayloads/LargePayloadStorageOptionsTest.java	Unit tests for options defaults and validation behavior.
azure-blob-payloads/src/test/java/com/microsoft/durabletask/azureblobpayloads/LargePayloadInterceptorTest.java	Unit tests for request externalization + response resolution across message types.
azure-blob-payloads/src/test/java/com/microsoft/durabletask/azureblobpayloads/LargePayloadIntegrationTest.java	Integration tests requiring DTS emulator + Azurite for end-to-end validation.
azure-blob-payloads/src/test/java/com/microsoft/durabletask/azureblobpayloads/BlobPayloadStoreTest.java	Unit tests for blob upload/download/compression behavior using mocks.
azure-blob-payloads/spotbugs-exclude.xml	SpotBugs exclusions for the new module.
azure-blob-payloads/build.gradle	Build/test/spotbugs config and dependencies for the new module.