Use Convention Plugins and Version Catalog

[Shadow-Devil]

Purpose

Gradle recommends to structure build logic into convention plugins which is very similar to the current approach but it is different, how the plugins are applied.
Before:

apply from: "$rootDir/gradle/javaProject.gradle"
apply from: "$rootDir/gradle/ballerinaLangLibLoad.gradle"

After:

plugins {
    id 'javaProject'
    id 'ballerinaLangLibLoad'
}

This also introduces a version catalog as a toml file, where all dependencies are centrally managed and can then be used via the libs property. e.g. libs.testng is the testng dependency.

References:

• https://docs.gradle.org/current/samples/sample_convention_plugins.html
• https://docs.gradle.org/current/userguide/sharing_build_logic_between_subprojects.html
• https://docs.gradle.org/current/userguide/dependency_management_basics.html#version_catalog

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

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (master@8100e00). Learn more about missing BASE report.
Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #43392   +/-   ##
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  Coverage          ?   77.49%           
  Complexity        ?    58570           
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  Files             ?     3438           
  Lines             ?   219204           
  Branches          ?    28912           
=========================================
  Hits              ?   169879           
  Misses            ?    39908           
  Partials          ?     9417           

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