Add Double/Int overloads for JSON schema numeric constraints

[mi12-root]

What

Support sending Ints & Doubles as JSON schema constraints.

Why

The SDK currently doesn’t handle numerical constraints in structured outputs correctly.
For example, using JSONField.maximum(Decimal(N)) gets translated into:

"maximum" : {
    "exponent" : 2,
    "isCompact" : true,
    "length" : 1,
    "isNegative" : false,
    "mantissa" : [1, 0, 0, 0, 0, 0, 0, 0]
}

a format that OpenAI does not support.

Affected Areas

JsonSchema/ module.