Apply spotlessApply to all code

[tuchida]

ref. #1024

diff --git a/build.gradle b/build.gradle
@@ -440,7 +440,6 @@ spotbugs {
 }
 
 spotless {
-    ratchetFrom 'code-formatting-required'
     java {
         googleJavaFormat().aosp()
     }

I ran ./gradlew spotlessApply in this state.

[p-bakker]

@gbrail @rbri thoughts? Can this be merged so we're done with all the reformatting and PR's can be cleaner?

[gbrail]

I'd like to catch up with the current backlog of PRs over the next day or two, at which point I'll either try to merge this or create my own PR!

[p-bakker]

Not sure if it should be tackled at the same time as this PR or not, but as part of #1120 it was suggested to also make line endings consistent, see a proposal here.

I guess the reason for wanting to combine the two is that is means files only need to be touched once? But if we stick to unix line endings (contrary to the earlier proposed switch to Windows line endings) files wouldn't have to change as they already use unix line endings

[gbrail]

I'd rather deal with the line endings separately (I'm still not sure that we need to change anything). Let's merge this!