Widening the type of ForEachLoop.Control.variable to Statement

[greg-at-moderne]

What's changed?

In Java:

• changing the type of ForEachLoop.Control.variable from VariableDeclarations to Statement.

In Javascript:

• using this to handle cases where for-of or for-in loops use a variable declared before the loop.

What's your motivation?

As designed with @jkschneider and @knutwannheden this is to accommodate a broader set of JS/TS for loops.

Anything in particular you'd like reviewers to focus on?

Note - this slightly changes the API for J.ForEachLoop. As checked before, this will cause some minor compilation issues in a few (roughly around 5) places downstream in openrewrite org.