New Global Assets endpoints

Broker API

Adds endpoints for retrieving global assets:

• List global assets.
• Retrieve a single global asset by symbol or asset ID.

Responses use the new GlobalAsset schema, with supporting GlobalAssetClass, GlobalAssetStatus, GlobalAssetExternalIdType, GlobalAssetCountryCode, and GlobalExchange types.

Affected Endpoints

• GET /v2beta1/assets
• GET /v2beta1/assets/{symbol_or_asset_id}