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Work out what declared files each param under when the endpoint compiles

`declared` answers, for each declared param, the key it is filed under
(its name, or the one `as:` gave it) and the empty value it stands for
when it was not passed (an Array, a Set or a Hash, after its documented
type). Neither depends on the request, and both were worked out again on
every call: the path to the param built to look its new name up, its
documented name spelled out to look its type up, that type matched
against the ones that have an empty value, and for a Hash every
documented param scanned for a child.

`Grape::DeclaredParams` holds them per endpoint, built by
`Endpoint#compile!` as `Validations::UndeclaredParams` is, and
`DeclaredParamsHandler` walks its params.

A param a `desc` documents by hand with a type that is not a String, or
with no Hash of details, has no empty value. `declared` raised on it
when it was not passed.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

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