2.25.0
(feat): Add support for SDK variables (x-fern-sdk-variables / variables in api.yml). Each variable
becomes an optional, named constructor parameter on the root client (also settable through the
options array and per request). Path parameters bound to a variable are removed from endpoint
method signatures and request classes and resolved from the client instead. String variables
that declare an environment variable fall back to getenv() when no value is passed, and a
clear InvalidArgumentException is thrown when a bound variable is still unset at call time.