add fastjson2 dependency to benchmark

[chaokunyang]

What this PR does / why we need it?

Without this dependency, I can't run benchamrmk in intellij idea

Summary of your change

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

[chaokunyang]

@wenshao

[wenshao]

It has a dependency fastjson2-extension, which includes fastjson2.

[chaokunyang]

Yes, I also noticed that. It shoudl work by transitive dependency. I'm not sure why it not work for me. But after adding it, it can compiles now. I guess it's a bug of intellij idea.