Add support for droplet autoscale pool

[asaha2]

- [x] vendor latest godo

• implement datasource methods
• implement resource methods
• add unit tests

[loosla]

Hey Aditya, could you please include an API documentation link in the description if you have one. Thanks 🐬

[asaha2]

@loosla the openapi spec is still in review: here's the open draft
digitalocean/openapi#949

[andrewsomething]

Overall this looks great! 🙌

There are some complications we need to consider around images though. (See discussion in-line.)

It would also be great to get some documentation (see /docs directory for examples.).

[asaha2]

@andrewsomething I've added to the docs and a test sweeper function for cleanup as well ☑️ ready for another round of 👀

[andrewsomething]

Thanks for the changes! Good catch with the sweeper!