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Introduce Grape::Validations::CoerceOptions value object (#2722)

`ValidationsSpec#coerce_options` returned an ad-hoc
`{ type:, method:, message: }` Hash that flowed (deep-frozen) into
`CoerceValidator` as its `options` argument and was poked at by
`ParamsScope#check_coerce_with` / `#validate_coerce`. Unlike most
validator options, this Hash is *never written by the user* — it is
assembled internally from the parsed `type:` / `coerce_with:` /
`coerce_message` declaration — so it has a fixed shape and no public
contract to preserve.

Replace it with a `Grape::Validations::CoerceOptions` Data value object
(`Data.define(:type, :coerce_method, :message)`, all defaulting nil).
The member is `coerce_method`, not `method`, to avoid shadowing
`Object#method` (`Lint/DataDefineOverride`); it also matches
`ValidationsSpec`'s existing `coerce_method` vocabulary.

- `ValidationsSpec#coerce_options` builds the value object.
- `ParamsScope#check_coerce_with` / `#validate_coerce` read `.type` /
  `.coerce_method` instead of `[:type]` / `[:method]`.
- `CoerceValidator` reads `@options.type` / `@options.coerce_method`.
  `Base#message` can't see a custom message off a Data (it probes
  Hash-like `key?`), so `CoerceValidator#initialize` restores
  `@exception_message` from `@options.message`, preserving
  `type: { value:, message: }` behaviour.

`Grape::Util::DeepFreeze` returns the Data as-is (its `else` branch);
`Base.new` already freezes the whole validator instance, and the Data
is structurally immutable. No user-facing contract changes — users
never construct or read this Hash; no spec hand-builds it.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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