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Read-only AST types (#1121)

**Potential breaking change: Where previously AST would produce `null`, it now produces `undefined`**

This tightens up the AST types to produce readonly covariant fields, $ReadOnlyArray in a couple places (not AST yet, perhaps in a future PR), and replaces `field?: ?Rule` with `field?: Rule` to exclude the possibility of `null` from `undefined` for optional rules, reducing complexity.

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