Media resolution enum for controlling token allocation on media inputs.
Convert API value to enum atom.
Convert enum atom to API string.
@type t() :: :media_resolution_unspecified | :media_resolution_low | :media_resolution_medium | :media_resolution_high
@spec from_api(String.t() | nil) :: t() | nil
@spec to_api(t() | atom() | nil) :: String.t() | nil