Adding rewind client API

[bachuv]

Adding the rewind API for the Java SDK.

• Added a new rewindPostUri to HttpManagementPayload
• Introduced rewindInstance API in DurableTaskClient
• Update protobuf definitions
• Added tests and samples

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 pull request adds support for the rewind functionality in the Java SDK for Durable Task Framework. Rewind allows failed orchestrations to be replayed from their last known good state, which is useful for recovering from transient failures.

Changes:

• Added rewindInstance API methods to DurableTaskClient and DurableTaskGrpcClient for rewinding failed orchestrations
• Added rewindPostUri field to HttpManagementPayload to support HTTP-based rewind operations in Azure Functions
• Updated protobuf definitions with ExecutionRewoundEvent and related changes to support the rewind feature

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
client/src/main/java/com/microsoft/durabletask/DurableTaskClient.java	Adds public API methods for rewinding orchestration instances with optional reason parameter
client/src/main/java/com/microsoft/durabletask/DurableTaskGrpcClient.java	Implements rewindInstance by building and sending RewindInstanceRequest via gRPC
azurefunctions/src/main/java/com/microsoft/durabletask/azurefunctions/HttpManagementPayload.java	Adds rewindPostUri field with reason parameter placeholder for HTTP-based rewind operations
samples/src/main/java/io/durabletask/samples/RewindPattern.java	Demonstrates rewind functionality with sample code that fails once then succeeds after rewind
endtoendtests/src/test/java/com/functions/EndToEndTests.java	Adds end-to-end test for rewind functionality and improves test configuration with @BeforeAll setup
endtoendtests/src/main/java/com/functions/RewindTest.java	Implements Azure Functions-based test orchestration that demonstrates the rewind feature
internal/durabletask-protobuf/protos/orchestrator_service.proto	Adds ExecutionRewoundEvent and extends multiple messages with new fields for rewind support
internal/durabletask-protobuf/PROTO_SOURCE_COMMIT_HASH	Updates to reflect the new protobuf source version
CHANGELOG.md	Documents the new rewind client API feature
.github/workflows/build-validation.yml	Increases emulator initialization wait time and adds logging for better CI reliability

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