Include configurable variables in imported packages to the schema

[Dilhasha]

Purpose

Add support to configure configurable variables in imported packages to the schema

Fixes https://github.com/wso2-enterprise/internal-support-ballerina/issues/690

Approach

Extend existing implementation to get the configurable variables for the imports as well.

Samples

• Create a ballerina package
• Update the content in default module with the following.

main.bal

import ballerina/log;

configurable string itemCode = "item12393";

public function main() {
    log:printInfo("hello");
    log:printInfo("hello debug");
}

The generated config-schema.json

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "ballerina": {
      "type": "object",
      "properties": {
        "log": {
          "type": "object",
          "properties": {
            "format": {
              "type": "string",
              "description": ""
            },
            "level": {
              "type": "string",
              "description": ""
            },
            "modules": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "name": {
                    "type": "string"
                  },
                  "level": {
                    "type": "string"
                  }
                },
                "additionalProperties": false,
                "required": [
                  "name",
                  "level"
                ],
                "name": "ballerina/log:2.9.0:Module"
              },
              "description": ""
            }
          },
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    },
    "dilhashanazeer": {
      "type": "object",
      "properties": {
        "simpleconfigs": {
          "type": "object",
          "properties": {
            "itemCode": {
              "type": "string",
              "description": ""
            }
          },
          "additionalProperties": false
        }
      },
      "additionalProperties": false
    }
  },
  "additionalProperties": false
}

Remarks

TODO:
Add test cases in the distribution repository - ballerina-platform/ballerina-distribution#5445

Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

Attention: Patch coverage is 79.01235% with 17 lines in your changes missing coverage. Please review.

Project coverage is 77.30%. Comparing base (6874aa0) to head (553bcc9).
Report is 24 commits behind head on master.

Files	Patch %	Lines
.../main/java/io/ballerina/projects/ConfigReader.java	79.22%	3 Missing and 13 partials ⚠️
...cts/internal/configschema/ConfigSchemaBuilder.java	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #42908   +/-   ##
=========================================
  Coverage     77.29%   77.30%           
- Complexity    51351    51353    +2     
=========================================
  Files          2932     2932           
  Lines        204511   204572   +61     
  Branches      26693    26706   +13     
=========================================
+ Hits         158081   158143   +62     
+ Misses        37838    37835    -3     
- Partials       8592     8594    +2     

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