Lua filter internals: push Shared.Element as userdata

Hierarchical Elements were pushed to Lua as plain tables. This is
simple, but has the disadvantage that marshaling is eager: all child
elements will be marshaled as part of the object. Using a Lua userdata
object instead allows lazy access to fields, causing content marshaling
just (but also each time) when a field is accessed. Filters which do not
traverse the full element contents tree become faster as a result.

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