Remove the catch all logics for azure-functions-java-library for cold start improvement

[kaibocai]

We should remove the catch-all logics in java worker for cold start improvement.

This will be a break change for customers who are using old maven plugin to build their function app, since the old plugin will remove azure-functions-java-library in their lib folder during build process. Without catch-all logics in worker there is no way for worker to know class from azure-functions-java-library, cx code will break.

We can introduce the change in V5 asking cx to use latest maven plugin for their V5 function app.

[kaibocai]

FYI @safihamid