9.0.0 - Versioned API endpoints and renamed ExposeType arguments

Couple resource configuration to an explicit api version: a single
typeName can now be exposed multiple times under different apiVersion
strings, and the endpoint discovery, generic model controller and
write paths all honor that. Versioned type names like
"package/command@v1" are accepted in POST bodies; unversioned type
names work inside versioned URLs.

Requires netlogix/jsonapiorg ^7.0 for the matching ExposableType
support.

BREAKING CHANGE: ExposeType has been reshaped:

• It is now final and built around PHP 8 attributes with
  constructor-promoted public readonly properties.

• The infrastructure-side arguments have been prefixed with
  "request" to separate them from the domain-side ones:

  packageKey -> requestPackageKey
  controllerName -> requestControllerName
  subPackageKey -> requestSubPackageKey
  actionName -> requestActionName
  argumentName -> requestArgumentName

• Two new properties apiVersion and replaces drive the
  versioning behaviour.

BREAKING CHANGE: The endpoint discovery route argument changed from
{packageKey} to {apiVersion} (accepting "all", "next" or a concrete
version); existing route configurations need to be updated.

BREAKING CHANGE: The internal Configuration array has been replaced by
a typed Configuration object; any code consuming the previous array
shape needs to be adjusted.