Add ExternalDependency annotation

[Thushara-Piyasekara]

Purpose

$subject
With this PR, a new annotation is introduced to annotate ballerina type definitions which are accessed through external Java dependencies.

Fixes #42205

Approach

This new annotation was added to jballerina.java lang library. It can be accessed by importing jballerina.java in any ballerina module.

Samples

import ballerina/jballerina.java;

@java:ExternalDependency
function foo(int x) returns int {
    return x * 2;
}

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

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 ✅

Project coverage is 77.29%. Comparing base (8bbaeaa) to head (6d3dd2d).
Report is 66 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #42792   +/-   ##
=========================================
  Coverage     77.28%   77.29%           
- Complexity    51339    51350   +11     
=========================================
  Files          2929     2932    +3     
  Lines        204465   204510   +45     
  Branches      26683    26691    +8     
=========================================
+ Hits         158030   158083   +53     
+ Misses        37846    37837    -9     
- Partials       8589     8590    +1     

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[prakanth97]

LGTM!