Add validation logic to args passed to call methods and refactored BMethodType

[ravinperera00]

Purpose

Task

A caller was able to call a method/function using callMethod() or callFunction() using an arbitrary number of arguments. Validation was added to check whether at least the mandatory number of args are passed.

Fix

BMethodType class was returning null as the rest type when a rest type was present. This issue was fixed to return the expected rest type.

Fixes #43785 #43874

Approach

Task

Analyse the mandatory number of arguments needed to call a particular method and throw an error if that number is not met.

Fix

BMethodType was using the wrong parent constructor. Updated the class to use appropriate parent constructor.

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