fix(OpenAI): allow null names and boolean choice values in Decisions

[APX403]

What:

• Bug Fix
• New Feature

Description:

When a question is sent to the Decisions API without a name, its answer comes back with "name": null, and choice values can be booleans as well as strings. The API reference types name as string or null on all four answer types, and choice and the probability value as string or boolean. The classes added in #812 declare them as string, so parsing such a response throws:

TypeError: OpenAI\Responses\Decisions\PredicateAnswer::__construct(): Argument #2 ($name) must be of type string, null given
TypeError: OpenAI\Responses\Decisions\ChoiceProbability::__construct(): Argument #1 ($value) must be of type string, true given

name is now nullable on the four answer classes, and choice and value accept string|bool, the same types as the models in openai-python and openai-node. Decisions is not in a tagged release yet, so no released version has the narrower types.

[iBotPeaches]

thanks!