Create a ktlint rule to standardize import

[zhangzhx]

Some of the rules we need to consider:

• Do we want import as?
• import some.package.* is not allowed

[rli]

ktlint has editorconfig support, maybe we just need to set that up.
ktlint, intellij plugin

couple of things i've noticed; there might be more:

• long code lines: when do we break?
• import ordering
• 4 vs 8 spaces for "Continuation indent"

[abrooksv]

We also need to migrate our ktlint rules to new package pattern and migrate to https://github.com/pinterest/ktlint

[abrooksv]

There is an experimental ktlint rule for this on 0.32.0

https://github.com/pinterest/ktlint/blob/master/ktlint-ruleset-experimental/src/main/kotlin/com/pinterest/ktlint/ruleset/experimental/ImportOrderingRule.kt