ErrorProne rule to standardize nullability annotations on JSpecify

[ash211]

Not sure it's ready yet to excavate across all our repos, but I'm starting to see some internal repos move to using JSpecify nullness annotation and I'd rather not do that manually.

https://jspecify.dev/docs/whether/

[cpovirk]

Hi, I will try to use this as motivation to throw our Google-internal migration tool over the wall sometime soon. We used it on Guava, so it should be reliable; I just haven't made it user-friendly :(

FYI, I'm under the impression that it's possible to migrate today using OpenRewrite, but I'd really like to have something for people on the Error Prone ecosystem. (OK, what I'd really like is to have a standalone tool that can run much faster.... But I don't want the perfect to be the enemy of the good.)

[ash211]

That would be much appreciated, thank you!

[jhult]

@cpovirk - any news to share?

[cpovirk]

I'm sorry, I should probably have been less optimistic here to begin with, and I've had a cascade of other things going on, so I haven't gotten to this. It remains on my to-do list, but I don't know if I'll have time in the coming weeks, either.