Add support for resuming after execution timeout

[marekdedic]

Currently, there is a ~20 minute execution timeout on the server-side of the script

We should add support for resuming the run from the client-side.

With support for folder merging already in, a lot of the times the script can be just re-run, however, there is an issue with files that get copied over - if #3 is implemented, the script could really just be re-ran. Otherwise, some more complex logic for saving move state is required.

https://medium.com/geekculture/bypassing-the-maximum-script-runtime-in-google-apps-script-e510aa9ae6da

[marekdedic]

POST request response:

)]}'

[["op.exec",null,[4,[],"Exceeded maximum execution time","ScriptError"]],["di",1800602,null,null,null,null,[],[],null,null,[],[],[]]]