fixes: #2982

• add new FunctionalInterface ThrowingConsumer<T> extends Consumer<T>
• add variant of assertArg that takes a ThrowingConsumer rather than a Consumer

I might be biting more than I can chew here, but here goes. My first PR here and I am very new to the whole open source in general, so feedbacks are most appreciated.

Checklist

• Read the contributing guide
• PR should be motivated, i.e. what does it fix, why, and if relevant how
• If possible / relevant include an example in the description, that could help all readers
  including project members to get a better picture of the change
• Avoid other runtime dependencies
• Meaningful commit history ; intention is important please rebase your commit history so that each
  commit is meaningful and help the people that will explore a change in 2 years
• The pull request follows coding style
• Mention Fixes #<issue number> in the description if relevant
• At least one commit should mention Fixes #<issue number> if relevant