Combine ArrayLiteral, MRHS, QSymbols, QWords, Symbols, Words into ArrayNode

[kddnewton]

All of these nodes are effectively arrays. We should combine them. YARP has:

• elements - the list of elements in the array
• opening_loc - the source range representing the opening (e.g., [, %w[, or omitted)
• closing_loc - the source range representing the closing (e.g., ], }, or omitted)