feat: add api-workflow plugin

[lixf311]

Ⅰ. Describe what this PR did

Add ai-workflow plugin，the first version only supports tools.

Ⅱ. Does this pull request fix one issue?

fixes #1225

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews