Internalize format and error-response defaults behind Grape::Util::InheritableSetting accessors

[ericproulx]

Starts the namespace_inheritable half of the InheritableSetting cleanup (#2795–#2804 covered the stackable side): the serialization and error-response defaults written by the format, default_format, default_error_formatter and default_error_status DSL methods are now recorded and read through intention-revealing accessors on Grape::Util::InheritableSetting.

New accessors on InheritableSetting

Accessor	Replaces
format / format=	namespace_inheritable[:format]
default_format / default_format=	namespace_inheritable[:default_format]
default_error_formatter / default_error_formatter=	namespace_inheritable[:default_error_formatter]
default_error_status / default_error_status=	namespace_inheritable[:default_error_status]

Notes:

• Naming: these are nearest-wins scalars — a nested scope's assignment overrides an inherited value — so the writers use plain = rather than the add_* naming reserved for stackable registrations. The naming now documents the semantics.
• Converted call sites: DSL::RequestResponse (all four get-or-set DSL methods), Endpoint (initialize's default_error_status ||= 500 seeding, build_stack, error_middleware_options) and DSL::InsideRoute#error!. With this, error_middleware_options no longer touches any raw store.
• Storage under the raw keys is unchanged, so to_hash output and any external readers see the same values; the raw keys should now be considered internal.
• Specs assert through the accessors.

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