feat: support request body encoding option

[Himenon]

Summary

close: #104

https://swagger.io/docs/specification/describing-request-body/#:~:text=The%20serialization%20strategy%20is%20specified%20in%20the%20encoding%20section

+ export interface Encoding {
+     contentType?: string;
+     headers?: Record<string, any>;
+     style?: string;
+     explode?: boolean;
+     allowReserved?: boolean;
+ }
 export interface RequestArgs {
     httpMethod: HttpMethod;
     url: string;
     headers: ObjectLike | any;
     requestBody: ObjectLike | any;
     queryParameters: QueryParameters | undefined;
+    requestBodyEncoding?: Record<string, Encoding>;
 }

Test Plan

snapshot

[Himenon]

add