Add high-level APIs to the modules

[jiqicn]

It would be nice to have some high-level APIs to simplify the usage of the package, as the users will not always need to configure all the steps of computation, but will directly apply the default setup instead.

However, since the module will also be used as the backend of the GUIs, it would still be nice to deploy these high-level APIs among modules, to make sure they can be called step by step. This will also benefit the further development of new features.