fix(python): synthesize defaults for required fields missing from examples in wire tests

[iamnamananand996]

Description

Refs: getbrevo/brevo-python#25, getbrevo/brevo-python#27

Fixes a bug where generated wire tests instantiate required types without populating required fields, causing Pydantic ValidationError at runtime. For example, BatchDeleteObjectRecordsRequestIdentifiersIds() is generated with no args even though ids: List[int] is required.

Link to Devin Session: https://app.devin.ai/sessions/0ef5ad19238e478d973dee98f739e425
Requested by: @iamnamananand996

Changes Made

• Modified DynamicTypeLiteralMapper.convertObjectEntries() to detect required properties missing from the example and synthesize reasonable default values
• Added synthesizeDefaultValue() dispatcher that handles all type categories (primitives, literals, lists, sets, maps, named types, unknown)
• Added synthesizeDefaultPrimitive() with sensible defaults per primitive ("string" for strings, 1 for ints, 1.1 for floats, etc.)
• Added synthesizeDefaultLiteral() and synthesizeDefaultNamed() (handles aliases, enums, objects) with recursion prevention via a seen set to avoid infinite loops on circular type references
• Updated dynamic snippet snapshots reflecting the fix (e.g. UserProfileVerification() → UserProfileVerification(verified="string"))
• Added version 4.63.6 changelog entry

Important Review Points

1. Union types return nop(): discriminatedUnion and undiscriminatedUnion don't get synthesized defaults — if a required field is a union type, it will still be omitted. Is this acceptable or should we pick the first variant?
2. Enum defaults use raw wire value string (python.TypeInstantiation.str(firstValue.wireValue)) rather than an enum class reference — verify this is correct for generated test code
3. Only nested objects are fixed: The same associateByWireValue pattern exists in EndpointSnippetGenerator for top-level body args, but those are less likely to hit this issue since IR examples typically include top-level required fields
4. Seed tests not yet run — should be validated by CI or manually

Testing

• Dynamic snippet snapshot tests updated and passing (32/32)
• TypeScript compilation passes
• Biome lint checks pass
• Seed tests pending (CI)

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