fix(langchain): allow to set strict tag manually in providerStrategy

[Christian Bromann (christian-bromann)]

ref langchain-ai/langchain#34149

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[Hunter Lovell (hntrl)]

I'm generally not a fan when libraries bring positional args to APIs. Instead of having the second arg be strict, can we have a union for the first type that allows for either: a generic schema object, or an object that has schema + strict args? E.g.

providerStrategy(z.object(...))
// or
providerStrategy({ schema: z.object(...), strict: true })

(this is how we do it in withStructuredOutput)

[Christian Bromann (christian-bromann)]

Hunter Lovell (@hntrl) thanks for the feedback! Updated PR accordingly.