feat(#339): add longshort ratio v5 method

src/types/request/v5-market.ts

@@ -125,3 +125,10 @@ export interface GetDeliveryPriceParamsV5 {
   limit?: number;
   cursor?: string;
 }
+
+export interface GetLongShortRatioParamsV5 {
+  category: 'linear' | 'inverse';
+  symbol: string;
+  period: OpenInterestIntervalV5;
+  limit?: number;
+}

src/types/response/v5-market.ts

@@ -120,7 +120,7 @@ export interface SpotInstrumentInfoV5 {
   riskParameters: {
     limitParameter: string;
     marketParameter: string;
-  }
+  };
 }
 
 type InstrumentInfoV5Mapping = {
@@ -290,3 +290,10 @@ export interface DeliveryPriceV5 {
   deliveryPrice: string;
   deliveryTime: string;
 }
+
+export interface LongShortRatioV5 {
+  symbol: string;
+  buyRatio: string;
+  sellRatio: string;
+  timestamp: string;
+}