[WIP]Integrate Serverless Workflow as OpenFunction Workflow Engine

[walterlife]

Proposal If you have a detailed proposal, you can also submit it via pull request

An outline of the proposal is provided here for reference:

• Motivation
• Goals
• Example
• Action Items

[benjaminhuo]

Let's have a additional community meeting this Thursday @wrongerror @wanjunlei @tpiperatgod @lizzzcai @webup

[lizzzcai]

I will be excited to see how OpenFunction integrates with EventMesh Workflow.