Add duplicates component

[AdRiley]

Pull Request Description

New duplicates component for helping when datasets that are expected to be distinct on a set of columns are not

Important Notes

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  TypeScript,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• Unit tests have been written where possible.

[jdunkerley]

Slight API tweaks please.
We should always error on a missing grouping.