Refactor frontend handler #3142
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What changed?
Refactor frontend handler to use Strategy.
Run make go-generate.
Why?
Frontend service has dcRedirectedHandler, accessControlledHandler and also wfHandler, which use struct instead of interface. This makes it difficult to flexible chose the correct handler to use.
This PR using Strategy pattern to solve it. see server.go for the major change.
How did you test it?
Unit test locally.
Potential risks
No risk