Add remaining visit implementations for expressions/statements

[JoshLove-msft]

#7313 did an initial pass at the statements/expressions needed to unblock the LRO work, but we should fill out the Accept/Visit methods for the remaining statements/expressions.

[JoshLove-msft]

Trim down the list of Visit methods to have only the ExpressionStatement and InvokeMethodExpression methods. We can add more as they are needed.