Ballerina OAuth2 authentication

oauth2-0.980.0.bal

endpoint http:Client oauthClient {
   url: "https://www.example.org/api/v1",
   auth: {
       scheme: http:OAUTH2,
       accessToken: "yf29.PlrfBb0gtDFXsbnE_LcDCG-Dz3djEp05zM9y-IPR8CsZz90XwOEyrhqeXPPYxubY9RHMIFzoV2",
       clientId: "50332352747-270vchcnbhbl4gfn1v91hl0fru.apps.example.org",
       clientSecret: "PrfEadE4s2SDG4hJ",
       refreshToken: "5/lk-u0Ywefgh52-v0_OLOkDhlsA9xIadf4qqD3TMQvc",
       refreshUrl: "https://www.example.com/oauth2/v3/token"
   }
};

public function testOAuth() {
   string requestPath = "/employees";
   var response = oauthClient -> get(requestPath);
   io:println(response);
}