Internalize namespace and mount-path registrations behind Grape::Util::InheritableSetting accessors

[ericproulx]

Continues the InheritableSetting cleanup from #2795–#2802: the Grape::Namespace objects registered by the namespace DSL (and its group / resource / resources / segment aliases) and the mount path recorded by mount are now written and read through intention-revealing accessors on Grape::Util::InheritableSetting, so no caller indexes into namespace_stackable for these keys anymore.

New accessors on InheritableSetting

Accessor	Replaces
namespaces / add_namespace(namespace)	namespace_stackable[:namespace]
namespace_path	Grape::Namespace.joined_space_path(namespace_stackable[:namespace])
namespace_requirements	namespace_stackable[:namespace].filter_map(&:requirements)
mount_path / add_mount_path(path)	namespace_stackable[:mount_path] / .first

Notes:

• The two derived readers absorb the read conventions previously spelled out at the call sites: namespace_path performs the joined-and-normalized prefix lookup used by both Endpoint#namespace and the namespace DSL getter, and namespace_requirements performs the requirements filter_map used by Endpoint#prepare_routes_requirements (still returning a fresh Array, which that call site appends to).
• mount_path absorbs the outermost-wins .first previously done in Endpoint#build_stack when configuring the versioner middleware, and documents it: with nested mounts the stack carries one entry per mount level, outermost first. The write side (add_mount_path) is recorded on the mounted API's top-level settings by DSL::Routing#mount, as before.
• Naming: the raw-stack reader is namespaces (plural) because InheritableSetting#namespace already exists as the reader for the InheritableValues namespace store; the doc comments call out the distinction.
• Also fixes the @param doc on Grape::Namespace.joined_space_path, which claimed the argument is a list of InheritableSettings — it has always been a list of Grape::Namespace objects.
• Storage under the raw keys is unchanged, so to_hash output, route pattern settings (settings[:mount_path] in Router::Pattern::Path, which reads the stacked Array via to_hash) and any external readers see the same values; the raw keys should now be considered internal.

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