New "lot_size" field on the global asset schema

Broker API

Adds lot_size to the GlobalAsset schema, exposing the tradable lot size for assets that trade in board lots (for example, 200 for a Hong Kong listing). Examples on the global asset endpoints have been updated to show the field.

Affected Endpoints

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