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Generalize middleware options to per-class Data value objects (#2718)

Following the per-feature `VersionOptions` / `RescueOptions` work in #2712
and #2716, middlewares that want typed option accessors now declare a
per-class `Options = Data.define(...)`.

`Middleware::Base#initialize`, when the subclass declares an `Options`
constant (ancestor search included), routes the kwargs through
`Options.new(**options)`:

- `@config` exposes the typed Data instance (named accessors).
- `@options` keeps returning a frozen `Hash` representation
  (`config.to_h.freeze`) for back-compat with subclasses that read
  `options[:key]`.

Subclasses without an `Options` constant still flow through the
`DEFAULT_OPTIONS` Hash + `deep_merge` path (`Filter`, `Auth::*`) unchanged.

- `Middleware::Formatter` (5 fields).
- `Middleware::Error` (14 fields). `rescue_options:` defaults to
  `Grape::DSL::RescueOptions.new`; an explicit nil (passed by
  `Endpoint#error_middleware_options` when no `rescue_from` was called)
  is coerced to the default in the initializer.
- `Middleware::Versioner::Base` (7 fields). Adds `content_types:` /
  `format:` so the `PrecomputedContentTypes` mixin's accessor reads land
  cleanly. `version_options:` defaults to `Grape::DSL::VersionOptions.new`.

Each `Options` field list is alphabetic.

- `attr_reader :options` still returns a frozen `Hash` for converted
  middlewares (now derived from `config.to_h`). Subclasses that read
  `options[:key]` keep working.
- `DEFAULT_OPTIONS` is restored as `Options.new.to_h.freeze` on each
  converted middleware so existing references continue to resolve.
  Marked `@deprecated` in the YARD comment; will be removed in a future
  release.
- `Options#[]` is defined on each Data class as a Hash-style shim that
  emits a deprecation warning via `Grape.deprecator` and forwards to
  the named accessor — gives any code that discovers the Data and
  reaches in with `[:key]` a migration nudge.

Passing an unknown kwarg to a... (continued)

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