Add Support to Generate GraphQL Schema for Local Service Variable Declaration

[zetcco]

Purpose

Fixes: #3317

Examples

This improvement enables to generate GraphQL Schema for the following locally defined backendService service object.

import ballerina/lang.runtime;
import ballerina/graphql;

public function main() returns error? {
    // local service variable declaration
    graphql:Service backendService = service object {
        resource function get greeting() returns string {
            return "Hello, World";
        }
    };
    
    graphql:Listener serverEP = check new(4000);
    check serverEP.attach(backendService, "graphql");
    check serverEP.'start();
    runtime:registerListener(serverEP);
}

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility
• No commons package changes (if there are any, please update the GraphQL version in GraphQL tools and Ballerina dev tools)
• No compiler package changes (if there are any, please update the GraphQL version in Ballerina dev tools)

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (e7e4061) 86.47% compared to head (121cb1c) 86.32%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...raphql/compiler/ObjectConstructorAnalysisTask.java	80.76%	2 Missing and 3 partials ⚠️
...mpiler/schema/generator/GraphqlSourceModifier.java	98.07%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1704      +/-   ##
============================================
- Coverage     86.47%   86.32%   -0.16%     
- Complexity      762      771       +9     
============================================
  Files           129      130       +1     
  Lines          9094     9153      +59     
  Branches       3563     3569       +6     
============================================
+ Hits           7864     7901      +37     
- Misses          923      948      +25     
+ Partials        307      304       -3     

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[ThisaruGuruge]

Shall we add test in the ballerina-tests module, so that we can test the runtime as well?

[sonarqubecloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

2 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud