Add support to overwrite the scopes config by resource annotation

[ldclakmal]

Purpose

This PR add support to overwrite the auth.scopes config of service annotation by resource annotation.

Fixes ballerina-platform/ballerina-library#973

Examples

1. scopes config defined at http:ServiceConfig annotation will be overwritten by the scopes config defined at http:ResourceConfig. That means, for the particular bar resource, the required scopes are "write" or "update".

   @http:ServiceConfig {
       auth: [
           {
               jwtValidatorConfig: {
                   issuer: "wso2",
                   audience: "ballerina",
                   signatureConfig: {
                       certFile: "./resources/public.crt"
                   },
                   scopeKey: "scp"
               },
               scopes: ["read"]
           }
       ]
   }
   service /foo on authListener {
   
       @http:ResourceConfig {
           auth: {
               scopes: ["write", "update"]
           }
       }
       resource function get bar() returns string {
           return "Hello World!";
       }
   }

2. scopes config not defined at http:ServiceConfig annotation. So, it will be appended by the scopes config defined at http:ResourceConfig. That means, for the particular bar resource, the required scopes are "write" or "update".

   @http:ServiceConfig {
       auth: [
           {
               jwtValidatorConfig: {
                   issuer: "wso2",
                   audience: "ballerina",
                   signatureConfig: {
                       certFile: "./resources/public.crt"
                   },
                   scopeKey: "scp"
               }
           }
       ]
   }
   service /foo on authListener {
     
       @http:ResourceConfig {
           auth: {
               scopes: ["write", "update"]
           }
       }
       resource function get bar() returns string {
           return "Hello World!";
       }
   }

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #604 (91d1240) into master (fa8e854) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #604      +/-   ##
============================================
+ Coverage     80.12%   80.13%   +0.01%     
  Complexity       67       67              
============================================
  Files           335      335              
  Lines         17089    17106      +17     
  Branches       3821     3827       +6     
============================================
+ Hits          13692    13708      +16     
- Misses         2659     2660       +1     
  Partials        738      738              

Impacted Files	Coverage Δ
ballerina/http_annotation.bal	100.00% <ø> (ø)
ballerina/auth_desugar.bal	97.93% <100.00%> (+0.21%)	⬆️
ballerina/auth_types.bal	100.00% <100.00%> (ø)
...a/stdlib/http/transport/message/MessageFuture.java	91.30% <0.00%> (-4.35%)	⬇️
...lerina/stdlib/http/api/logging/HttpLogManager.java	90.66% <0.00%> (-1.99%)	⬇️
...nsport/contractimpl/DefaultHttpResponseFuture.java	73.37% <0.00%> (-1.30%)	⬇️
...dlib/http/transport/message/HttpCarbonMessage.java	94.53% <0.00%> (-0.55%)	⬇️
...tractimpl/sender/ConnectionAvailabilityFuture.java	75.60% <0.00%> (+1.21%)	⬆️
...transport/message/Http2InboundContentListener.java	53.84% <0.00%> (+2.56%)	⬆️
...impl/listener/http2/Http2ServerTimeoutHandler.java	80.82% <0.00%> (+2.73%)	⬆️

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