Checkstyle import rules should be consistent with the codebase #9920
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The old checkstyle was similar but not identical to the Google Java Style Guide, and it seems that checkstyle updates have changed import behaviors in a way to make them incompatible with those conventions (but more compatible with the Google style). These new rules are a close approximation to the old convention, with a few exceptions, mostly that imports are all listed at the top. There were also some inconsistencies, such as grouping jsinterop and javaemul with java packages - those have been resolved as simply as possible, with checkstyle rules to enforce this.