Feat(developer-sdk): Meld Subdivision Ramp Option

[thewuhxyz]

• Adds typed ramp country/subdivision options to the developer SDK.
• Normalizes backend countries[].subdivisions[] responses into the SDK’s camelCase public shape.
• Preserves compatibility with older countryCodes-only ramp options responses.

[edo-chan]

Requesting changes on three blockers:

1. The required Developer SDK Python check is failing because Ruff would reformat packages/developer-sdk/python/src/swig_developer_sdk/ramp.py and packages/developer-sdk/python/tests/test_resource_clients.py. Please apply Ruff formatting and rerun the required check.

2. The country and subdivision normalizers at packages/developer-sdk/typescript/src/ramp/client.ts:121-175 and packages/developer-sdk/python/src/swig_developer_sdk/ramp.py:385-452 silently discard entries missing codes, synthesize missing names, and default missing subdivision arrays. This hides malformed successful responses, and the TypeScript and Python clients disagree when a present non-empty countries array contains only invalid entries. Keep the legacy fallback when top-level countries is absent or empty, but reject malformed entries once the array is present. Please add missing-field and cross-SDK parity tests.

3. serviceProviderCode is required, but the readers used at packages/developer-sdk/typescript/src/ramp/client.ts:325-371 and packages/developer-sdk/python/src/swig_developer_sdk/ramp.py:559-562 accept an empty string and coerce numbers or booleans into identifiers. Please require a non-empty actual string in both SDKs and add empty and wrong-type tests.

The snake-case and camel-case handling, public exports, and legacy country-code fallback otherwise match the merged backend contract.

[edo-chan]

Approving overall. The previously noted response-boundary items are non-blocking follow-ups; the required Python formatting check should still pass before merge.