Previously we were inconsistent by generating code for enum definitions
but not generating code for dictionaries. With future changes to the
IDL generator to expose helpers to convert to and from IDL values
this produced circular depdendencies. To solve this problem, also
generate the dictionary definitions in bindings headers.
Generating boilerplate is nice! This also has the bonus that we're more
correct: I included all the units listed in the spec before,
(see https://drafts.css-houdini.org/css-typed-om-1/#numeric-factory )
but we're supposed to exactly include ones for the units we support:
> If an implementation supports additional CSS units that do not have a
corresponding method in the above list, but that do correspond to one
of the existing CSSNumericType values, it must additionally support
such a method, named after the unit in its defined canonical casing,
using the generic behavior defined above.
> If an implementation does not support a given unit, it must not
implement its corresponding method from the list above.
Now, our factory functions will exactly match the units we support.
The changed test result is partly the order being different, and partly
that the container-query units are no longer included as we don't
actually support them.
