Add Saga Java quickstart[preview edition]

[skyao]

Description

This PR is to add a quickstart for saga pattern support in java.

The implementation of saga pattern is in lasted v1.11.0-SNAPSHOT version which is not merged and released yet.

At this time, This PR is a preview edition:

• Saga pattern support is still a proposal and under review and discussion.
• This PR is to help to understand how to use saga
• This PR is not a final version and will keep updating during the proposal review and discussion
• Don't merge this PR before the proposal is accepted and the design is finalized.

Issue reference

TBD: add issue here when the proposal is accepted, and the design is finalized.

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[skyao]

how to run this quickstart

Since the proposal of saga pattern support is still under review and discussion, the code of saga pattern implementation in dapr java sdk is in preview edition as described in PR dapr/java-sdk#941.

install dapr-sdk-workflows locally

To run this quickstart, we need to build and install dapr-sdk-workflows 0.11.0-SNAPSHOT dependency locally.

# clone the PR repo before it's merged
git clone [email protected]:skyao/java-sdk.git
cd java-sdk
# checkout to the saga branch
git checkout saga
# install dapr-sdk-workflows 0.11.0-SNAPSHOT locally
mvn clean install

run this quickstart

# clone the PR repo before it's merged
git clone [email protected]:skyao/quickstarts.git
cd quickstarts
# checkout to the saga branch
git checkout saga

cd workflow-saga/java/sdk

Then reference to the README.md file in workflow-saga/java/sdk folder.

[skyao]

This PR is replaced by #956

In the saga proposal, two solutions will be presented for comparison and discussion：

1. "saga-on-workflow": support Saga pattern as extension and no change to Dapr Workflow
2. "saga-in-workflow": support Saga pattern in Dapr Workflow as build-in feature