FR: Python api to do locking

[pgagne]

With the current design it seems like most of the "locking" logic is built into the main() method.

It would be nice to be able to import this tool and call a method with paramters in order to do locking.

Most of our workflows are defined in python code, and so rather then having to shell out to something it would be better to call a method directly that handling the locking/checking/releasing.

Perhaps this could be down in such a way to use things like context managers and/or async/await