Generate pub const for most of anonymous enums about rust-bindgen HOT 3 CLOSED

We do this for top-level anonymous enums IIRC (see the NODE_ flags in stylo). I agree it makes sense to expand this behavior and shouldn't be too hard.

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I guess it is not hard to generate consts, but it might be hard to determine whether an anonymous enum is used like enum { XXX } var;. If that's the case, we can probably generate both enums and consts.

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FWIW, I want this because in servo/servo#13674, we use a static const from Gecko side, which leads to linking failure on Windows. And I want to either convert that static const to a macro or an enum constant. It seems to me the latter is better because it is scoped.

If we can have this enhancement implemented soonish, I would use enum constants for that, otherwise, I'll change it to a macro.

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